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Why does my Thunderbolt turn off 2-3 times a day?

I've had this phone for about 3-4 years now, and in the last 6 months, it turns itself off with no reason 2-3 times a day.  If I don't have my earpiece in, I don't know it until I go to use the phone.  It happens with any kind of charge, so that isn't it.  In order to restart, I have to remove the back of the phone and remove the battery to reset.  The confusing thing is that the light flashes at the top as if it's on.  It is VERY frustrating!  Any thoughts?

Re: Why does my Thunderbolt turn off 2-3 times a day?

The HTC Thunderbolt was released in March 2011 about 3 years ago.

Have you tried a different battery? Does it reboot if you left it in airplane mode for a day just to see if the behavior is the same? Did it start shortly after an application was installed or updated?

I'm most definitely NOT a VZW employee. If a post answered your question, please mark it as the answer.

Re: Why does my Thunderbolt turn off 2-3 times a day?

I too have had my Thunderbolt for nearly three years now, and it too tends to spontaneously reboot several times a day, I have noted that the phone does better if I plan to reboot it myself during the day when I am not needing it or expecting a call,

It is especially more troublesome after it was upgraded OTA to Android 4.0x over a year ago.  Even though I had my doubts about the validity of the download, VZW told me that I could reset the phone again to reload the update... but this doesn't work so well, either.

It also tends to take forever to place a call and could stack up a list of outgoing calls just by repeatedly pressing the call button in trying to provoke a response from the phone.  I have had several lockups that have required removing the battery and reinserting it in order to get it to reset.

There also has been the maddening screen alert that tells me that I have no sim card installed and that I have to activate it in order to use it.  Swipe the screen away and there is my old phone again.  I have had the sim replaced three times, and yet it persists.

There is no problem with the damn battery.  I have the HTC cradles all over the house and charger cables in the car.

A Verizon rep told me that the Thunderbolt was a known problematic phone.  I wonder why VZW hasn't fessed up and done right by its customers?

Re: Why does my Thunderbolt turn off 2-3 times a day?

I have all those same problems.  I hope my life never is dependent on  my phone for I will certainly die.