I'm having the same issues with the instant battery drain upon spontaneous shut down & then manual power up, rebooting the phone automatically at no specific times and/or reasons, and the "please...
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I'm having the same issues with the instant battery drain upon spontaneous shut down & then manual power up, rebooting the phone automatically at no specific times and/or reasons, and the "please wait while we set up your SIM card and activate your phone". This just started recently on my ThunderBolt and also my wife's ThunderBolt. We both updated our phones with ICS the same day (the same day they became available for update which was a few months ago), and both have started acting like this just recently. If it was a problem with an app downloaded, I could understand why mine is doing it, however, she doesn't download apps as much as I do. In fact, she probably hasn't downloaded an app recently in the last month or two (unless it was a game for the kids to use, which could have been recent). Just this morning, my phone has randomly shut itself off 5 times. Each time I've manually turned it back on, it's shown at least 50% less battery than what I had prior. At one point this morning (after being on the charger all night long, and showing a 100% charge), within about 1 hour, it shut itself off and then showed a 64% charge. Within 15 minutes, it shut itself off again (I WASN'T DOING ANYTHING WITH THE PHONE, it was simply in my holster on my hip). Then when I turned it back on, it showed 3% charge, and wouldn't turn back on until I plugged it into the wall charger. Once it turned back on, it showed a 79% charge and was charging. While our phones are plugged into a charger (car or wall), they don't crash like this. I'm about to pull the SIM card & SD card, and reboot the phone in regular mode. If that doesn't work, I'm gonna try putting the SIM card back in, but leaving the SD card out and rebooting in SAFE mode for 24 hours, to see if that helps. If it doesn't crash while in SAFE mode, then I'll put the SD card back in and restart it once more. Hopefully, I'll be able to post a reply on my comment here by Monday stating it worked. But if not, I'll be posting my results and hopefully a Verizon CSR or Tech rep will have other suggestions. Our phones have also recently been popping up other issues of certain things that aren't working or have shutdown. One of them states something about the UI not working or has shut down. The next time I see any error on either of our phones, I'll be sure to either take a screen shot of it or write down the exact error and post them on here in a reply as well.