So I just upgraded my Lumia 640 to the Windows 10 Mobile option and enjoy it except for one thing. Every once in a while (once a day or every two days), my phone will just start vibrating nonstop and will not respond to any button presses of any kind. Power button doesn't work, volume up and down buttons don't work. Not as far as i know, anyway. The only way to get it to stop is to open the back plate, pull out the battery, and put it back in for it to stop. Is there any other way to go about restarting my phone without having to remove the battery? Has this happened to anybody else?