iPhone 4 periodically won't wake up

I have experienced the same problems with my IP4 and my amateur testing also points to temperature as the culprit. Soft restore, hard restore, Genius Bar restore and even 4.01 update didn’t fix the problem. After others mentioned temperature I got to thinking about when and where my IP4 locked up and temperature definitely made sense. At night I keep the AC lower, since the IP4 isn’t being used, held or on the charger, the IP4 core temp is going to drop. This being the theory I set out to replicate the problem by placing my IP4 on a glass shelf in the fridge and in less than 5 minutes it locked up…again, and again, and again. We are only talking about 5 minutes in a fridge. This is not sub-zero harsh temperatures, in fact the temperature of the fridge is within the listed operating temperature of 32° to 95° F on Apple’s website. Genius Bar has ordered my IP4 replacement and I’m very curious if the problem can be replicated on the new phone. Hopefully this problem is isolated to just a batch of phones but as summer passes and colder temperatures set in I wonder if this problem will gain greater attention.

Same issue for me. Twice this week. One time before 4.0.1 update, one time after.

Symptoms :
- doesn't wake up
- doesn't respond to vibrate switch
- doesn't recognize by iTunes
- needs a hard-reboot to resurrect.

It looks like battery was completely drained out but i'm pretty sure that's not a battery issue, because each time it was unplugged just few minutes ago.

I've restore few hours ago without restoring from backup. Wait & See if it happens again.

Hi

i have the same problem , but i want wait for the next OS Update !

The temperature theory is one I hadn't seen before, but unfortunately it doesn't tally with how my phone behaved. Mine would go into a coma overnight when the temperature in the rool was completely normal, and most often at work while sitting on my desk. Again no unusual temperature levels involved.

Carphone Warehouse (I'm in the UK) finally called yesterday to say they had got some phones delivered and were holding one back for me. Went into town and collected it. It's been on charge pretty much the whole time since then whilst I have re-installed all my apps and got them set up, and transferred my music (takes ages as I set iTunes to convert down to 128kbps when moving to the phone to make more efficient use of storage space). I was tempted to restore from my old phone as evidence here suggests that it's hardware related, not software, but decided to set it up as a new phone so that if it has the same issue, I know a backup from my old phone can't be the cause.

The old phone would sometimes go a day or two without a problem (then would go into a coma a dozen times in a few hours!), so if I get to the end of the week without the new phone going into a coma I will start to be confident that this one is fine.

Same problem for the last 4 days...
This is the log before it went into coma.
Syslog

There are no assertions for PDP context 3: state 0
Aug 14 01:02:45 iPhone-4 CommCenter[2019]: Telling CSI to go low power.
Aug 14 01:02:45 iPhone-4 CommCenter[2019]: CSI can enter low power, so now telling to do so.
Aug 14 01:02:45 iPhone-4 CommCenter[2019]: Will sleep. Heard from CSI in 0.0417 seconds

Happened once to me, two days ago. I couldn't be able to awake my Iphone, and had to force restart. Everything worked fine since then. Finger crossed !

Yeah mine started doing this yesterday. It's two weeks old.All data on it has been entered manually [like all phone numbers and calender dates]. Also the internet is too slow to be of any use. It doesn't see most wi-fi signals until i'm practically on top of them. Mines going back today.
cheers

I previously posted in this thread because my iPhone 4 had gone into a coma a few times. In my case, I'm going to lean towards the low temperature theory. We've had some cool nights here in PA recently and everytime my phone has gone into a coma. Throughout the day when I'm using it or it's in my pocket, I've had no problems. I'm going to see what 4.1 brings. If there's no change, then I'll be getting mine replaced.

I've had the sleep problem about 10 times with two different iPhones since I first got one 4 days ago, always occurring with the iPhone in my pocket.

I got a new iPhone 4 four days ago, and set it up using the information from my original model iPod Touch. All was fine until the next day, the first time I put it in my pocket to go somewhere. When I arrived and tried to use the phone it wouldn't start. I didn't remember the sequence of holding home + sleep so it seemed bricked until I got home, plugged it into my computer, and got it to wake up. It showed 34% charge, even though I'd used it a few hours before and it then had ~70% charge.

It was the day that hurricane Earl was brushing by, and I was worried that it was a humidity issue, similar to the one that made my iPod Touch useless on humid days, with touches on the screen being registered wrong. So I got the one day old iPhone 4 replaced with another iPhone 4, presumably refurbished, at the Apple store.

I set up the replacement iPhone from the backup. Since then it has failed to come out of sleep about 10 times over the past three days. All have occurred with the phone in my pocket, and the problem does not seem related to humidity since the weather has been dry since the hurricane blew by. Although the iPhone has been sleeping on my desk many times, sometimes connected by USB, sometimes not, it has never failed to come out of sleep when outside my pocket. I don't have a rim bumper yet; I ordered one as part of the free program but it is not supposed to arrive for weeks.

To address hypotheses raised by others: No apps have been running and no music has been playing when it went to sleep. I've never used the headphones. I use iTunes on Vista, having upgraded to the new version between the first iPhone and the second. All the songs were synced manually. The 3G reception in our area is nonexistent to terrible. Our WiFi is great, with two signal extenders giving excellent access with few dead spots. Email is set to sync manually only, with no push.

Although this thread is listed as "answered" it is far from "solved". The pattern of the problem occurring only with the iPhone in my pocket seems significant, though others reported different problems, though one could imagine unifying hypotheses such as signal changes. I can imagine the problem as being due to hardware, but one would have to assume that I got two bad phones, but since Apple changes phones by giving you someone else's returned phone I wouldn't exclude hardware as being the cause since it sounds like many people have returned phones due to this coma problem.

So I'm 4 days into getting a new iPhone and I now have a used iPhone that goes into a coma when I take it anywhere. I called 1 800 MYAPPLE today, went through their menu of automated questions, and was then told they were closed. At least I live a mile from an Apple store.

I just caught another coma episode, which happened a few minutes after I put the iPhone in my pocket. There was a white Apple logo on the screen with the ring of ten white bars at its base. I didn't wait to see how long this state would last; I did a forced restart.

If the computer is hung in an "on" state during these episodes that may account for the battery charge getting used up somewhat during the episodes.

I've had this issue too. My first iPhone had a screen fault, after sending it to the UK service centre (they couldn't recreate the fault) I had to take it to an Apple store where of course the fault was obvious and they swapped it for a replacement.

2nd iPhone has this coma problem. Always overnight, but otherwise no pattern to it at all. My first iPhone ever, so not restored from a 3G backup.

At present I have sent the phone to the service centre, though I posted it on Friday and the status hasn't been updated yet, knowing my luck with this poxy phone it's probably lost in the post. I really am starting to wish I hadn't bothered with an iPhone.

Although the service guys you speak to when you call (if you can get through in less than 10-15 minutes) are very helpful, the infrastructure around service and repair is very poor. I have to send my phone back to Apple or travel miles to the nearest store at my own cost in time and money when what I paid for should have been a working phone to start with, it's not as if these things are cheap. I've paid for and had an iPhone since the end of July but still haven't got a working one. And I am doing all the running around to try and get it sorted.

Are the phones they keep in the black boxes in the stores brand new or refurbished? I don't trust Apple on anything now.

I've noticed one other odd thing that may be a clue to the sleep crashes. A variety of emails in my trash have three copies of the same message. I don't know whether this is just one of those things that happens with crashes, or whether this might indicate that the iPhone trying to access mail from sleep is associated with the crashes.

In Mail settings I have Fetch New Data set to off, Push off, and Fetch set to manual, so trying to get email during sleep is not supposed to be happening.

I spoke to the (800) MY-APPLE folks today about this issue. Based on the attention this thread has gotten I got the call escalated right away to a senior support person. He had me go through the "How to back up your data and set up as a new device" procedure at http://support.apple.com/kb/HT4137.

It has been several hours and I've had no further problems.

I know that others have thought they had gotten past the problem and were later disappointed so I will report back again after a few days if it is still working, or earlier if the problem returns. But in the meantime I thought I'd share the detailed procedure that I used in case it helps others.

It sounds like one should never use "Restore from the backup of" unless it is the same device with the same OS. My recommendation to Apple is that they make that more clear.

It has been over a day since my Restore and I haven't had any of the sleep coma problems. I think this was solved for me. I'll report back if I have any problems, but since I'm about to do the OS 4.1 upgrade today, any comas or lack of comas may be hard to attribute.

Restoring to factory settings AND restoring from backup wont work..
The phone goes into a coma if I leave it idle for few mins and the only way to wake it up is to hold 'Power' and 'Home' buttons for 10 seconds,
Sometimes its will wake up by itself after minute or two...
I live abroad, do you guys think I can FedEx the device to Apple and get it back by FedEx?

Thank you!