Hi, this has happened to me a couple of times in the past week. Both times, my phone was in sleep mode and when I tried to use it again, it was totally dead. I could not turn it on or do anything until I took out the battery and reinserted it. then it boots up like normal.
I did the update, and both times it happened after the update.
Occasionally the phone randomly reboots when I am browsing online but this is different.
Thanks of any suggestions.