iPhone 3G keeps turning itself off and on by itself-Any advice how to stop?

Same problem here

My 3GS keeps turning off even though the battery is Reading at least 40%. When I plug it in the battery reads 1% then minutes later it's back to Reading what it was before?!

Sounds simple enough. Turning the sleep/wake button (top right) is pressed down to the turn the phone off. It's also pressed down when off to turn the phone on. Has it got bumped/dropped recently?

Anyone spill anything on it?

If not you might just have a faulty button and I would give Apple a call for advice as if it's just faulty and within warranty then you should just get a new one.

@Theonlyscookuk: Sounds like your iPhone is in need of battery reconditioning or a replacement battery. Either way your issue should be in its own thread as your problem is not related to this thread topic.

I have the exact same problem, the cycle is around 15 seconds.

The phone goes from standby to the 'slide to unlock' screen and then goes back to standby all on its own, and it does this continuously until it bleeds the battery dry - it's killing me as it keeps catching my eye when the phone's on my desk.

The following scenarios stop this happening.

- I switch the phone to silent (I'm using this as a stop gap solution).
- I'm playing music through the phone's speakers.
- I'm playing music through headphones.
- It's charging.
- It's connected to my laptop.

I've tried all the usual stuff, rebooting, restoring, airport mode, no wifi, switching off all notifications, removing all 3rd party apps, turning of all push/email related programs etc...

I'm pretty stumped to think what's causing this, when it started happening I'd done nothing new/different to the phone (no new apps installed, I'd not synced it, knowingly dropped it, had a issue plugging in the charger or headphones).

I'm at the point where I think I'm going to need to go to the O2 shop (one of my least favourite things to do) and experience customer service...there must be some clever dick out there that knows how to resolve this....?????

TIS (hopefully)

P.s. I've posted this in another thread on the same subject, just trying to increase my chances of it being seen.