My Apple Watch Ultra 2 has been acting sporadic

My watch did this twice. Reboot it. Press and hold the crown button and side button beside it for 10 seconds until the Apple logo appears. Apple has addressed this issue with a software update as well. Update to version 10.4. You may need to update your phone OS as well to update the watch OS

Same thing happened to me with the same watch (Ultra 2) and probably the same day. It was this Friday, the 2nd of February 2024 in between 20:30 and 21:00 (8:30 and 9:00PM) Central European Time (CET). The watch went crazy writing strange code and jumping from app to app. Took the watch off and it started entering pass codes (like someone trying to guess my passcode) until it got me a delay of 5 minutes. I turned it off. When on again I reset the watch with my phone. I then updated the Watch OS to the latest and also my phone iOS (Phone is 14 pro max). I was not doing any exercise or anything so moisture was not the problem. I was just sitting in front of my TV. Do you have more information about this?

I was able to fix mine by first restarting the watch by holding the two button on the right side of the case in until the Apple logo appears. Then it made me wait 5 minutes to input my passcode. After doing so it seemed ok, but I did notice that I had not updated my watch from 10.3 to 10.4. In order to do so I had to update my iPhone's software. then I was able to update the watch to 10.4. Everything seems to be rosy now. Hope this helps.

Had the same issue with my practically new S9 (2 months old). Called support in a panic as it appeared someone was trying to guess my passcode and kept locking me out. I finally got ahold of someone at Apple when it had locked out at over an hour and was advised to unpair the watch from the phone and start over. Fixed the problem, but happened again exactly 2 months later. Waiting to see if it happens again on the 31st of May......

I have had a similar problem. You would think that Apple could send users an alert that this issue is occurring with a link on how to remediate the problem... especially since it seems to be happening quite a lot. I have had a problem with count down timers popping up over and over. It only happens when I am physically working on something and I thought it was the back of my hand hitting a button... Apparently not. This last time after I deleted 2 dozen or so timers the passcode issue started and eventually put my Ultra 2 into 15 min of timeout. I was concerned about the problem and came here. After reading through the comments I decided to delete the watch and reset to factory setting and start all over again using the Watch App on my iPhone. This took quite a while, as updates to phone and watch were needed... but in the end it seems to be working fine now. This is super frustrating though and disappointing that Apple knows there is a problem and does little to let it's customers know it may happen or how to fix it.

Reseting to factory, using the iPhone Watch App, updating the watch to Watch IOS 10.4 and repairing to my phone fixed this problem for me.

Ultra 2 49mm watch was possessed... straight up exorcist vibe. Obviously was locked out due to incorrect passwords and couldn't do anything on watch

Found this post and did the unpair (input Apple ID password), and then did the pair setup including restoring from backup worked. Hopefully for now.

Still have warranty service as I just bought this a couple months ago so wondering if this a physical issue with the watch that needs to be repaired?

So after speaking with Apple Support on the 9th of April 2024, (following my Ultra 2’s autonomous meltdown at 2AM that morning) I was advised that it could either be a hardware issue or a software issue, but they would have to have the Ultra 2 to find out. They had an appointment available at my local Genius Bar for later that day. They confirmed an issue and sent my watch off for “repair/ diagnostic”. I heard back yesterday, after a little chasing from me, and they vaguely stated that they had completed their diagnostics and that they were sending me a replacement product. No real information on the root cause of the issue was given. I can only presume that it was primarily a hardware issue or they wouldn’t have replaced it? Guess I’ll keep guessing! Pleased to have “a” watch back on my wrist, but definitely not the “it just works“ experience that I pay for or I’ve come to expect from Apple. Thanks to the Community support, first time I’ve used it. I’ve learnt a few things that I hopefully won’t need! Best regards

see my post.ls above

Series 9 and U2 were affected by a bug in 10.3, fixed in 10.4

Your U2 is fine.

I had the same issue, today with my Ultra 2, April 1st. I restarted the watch which seemed to make me wait 5 minutes to put in my passcode. But it did stop cycling through passcodes as it had. After 5 minutes, I was able to enter my passcode, but did notice that my iPhone needed to be updated. So perhaps my phone was suffering from the same issues people faced in early February. I updated both my phone and watch software. Hopefully, that will put an end to this problem.

I had the same thing. I did a rest from the watch app on my phone. It unpaired that watch and it started working again. Weird

So my phone said I needed the new update but the watch showed it as being up to date. After playing with it for over an hour-turning on and off, pairing and unpairing it finally said that it was up to date on both. Not sure why the auto update never works. No more issues today.

I had the same issue I was at a friends house and all of a sudden my I watch ultra two turned into the exorcist. I thought somebody was remotely controlling my hand. I was finally able to turn the watch off and turn it on again and I did the latest update, so far so good. I talked with Apple support and they said maybe it was a way for them to tell us we have to update our software on our products. 🤔🤔

Did a hard reset then updated phone to 17.4.1 and watch to 10.4.

Put Apple Watch on its charger.

Press and hold the side button until you see the screen with the power button in the upper-right corner, then let go of the side button. If your Apple Watch has an earlier version of watchOS, you see the Power Off slider instead of the power button.

Press and hold the Digital Crown until you see the red Reset button.

Tap Reset, then tap Reset again to confirm. 

After Apple Watch unpairs completely, you can pair again. Remember that you'll need the Apple ID and password that were used to set up the watch. I recommend you do not restore the backup.