This has happened on my 8300 i used to have too, at about 32min into a phone call my 8310 & 8300 would completely restart, sometimes erasing all of my recent calls and texts. I take really good care of my devices i.e I restart them a few times a week just to get updates, keep the memory clear, empty cache, recent calls & messages etc. Can someone tell me why its doing this or how to fix it??? PLEASE!! Sometimes I like talking to my family more than 32min haha.