Lumia 920 Randomly Reboots / Cannot Be Turned Off

Question

Hello,
I have just bought a Lumia 920 today, and now have the problems described in the thread subject... Every few minutes while idle, the phone will power down and immediately power up again. This does render the phone useless to me...
When trying to shut it down to remove the SIM card I noticed I cannot even shut it off. It would instantly turn itself back on again.
Did anyone else notice this kind of behaviour from their Lumia 920 (or maybe other phones as well)? I was really looking forward to this device and this really ruins it for me
Thanks in advance!
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Answer 1

Same thing on my Lumia 920 unit from ATT, received just today via online purchase. Began resetting within 30 minutes, and continues to do so, especially in places like voicemail and phone functions. Also fails to register initial settings like search engine (on every reset, goes back to Bing instead of Google) and other things I've had to re-configure 3 or 4 times. It took about four tries to get a Texas map database to download, despite using a home wi-fi right next to the wireless router.
I don't think this is a SIM problem at all, because the rests don't always take place in the phone section. And I've even turned the cell phone data feature off, and still the reboots. It MAY be the micro-USB connector, because since I've been charging the phone while initializing it, the resets happen with it inserted. But this is also the data cable, so if the unit resets all the time while moving huge chunks of desktop data, then it is useless. If the micro-USB connector is that rickety, more trouble is down the road.
This is a real shame, becuase I like the phone and was ready to switch from iPhone. Now I'm stuck with something I have to send back and try to get my old iPhone to work again, so at least I'll have some cell phone calls.
About eight hours of my time loading music, getting familiar, and configuring for my home desktop windows 8. If my Windows 8 desktop rebooted my machine eight times in only a few hours of initial usage, I'd be going back to old desktop as well.
Again, very sad, because this seemed to be a great phone with great features at a low-low price. I guess when it seems too good to be true, it is. iPhone may be falling behind in some ways, but at least it's been a reliable phone for three years.
Lucky I have 14 days money back, return to old phone, no questions asked. But it took less than half a day to figure out the phone didn't work.
About the only possible fix would be some firmware upgrade promised to fix it permanently, but they had better make a big deal about publicizing, or have a million returns on their hands.