Lumia800 bugs & crashes
Bugs and crashes i have seen occurring in the last days. Latest OS version 7740.xx.
1. On receiving a phone call, Lumia800 showed that the call was connected after then gave no sound, 10 second later restarted itself. Rather than reboot onto OS didn't boot but showed the red and white battery icon on the black background. This behaviour looked like a drained battery. When USB power was connected the device would a bit later boot properly. I verified battery status, which gave me 83%.
2. All hardware buttons on the Lumia800 stopped responding at some point in time. On turned off it was unable to open up the lockscreen. Could get to lockscreen by plugging in the charger, which will bring on the display. After that, none of the hardware buttons still didn't work. So rebooting was impossible. In the diagnostic app I could see that the buttons did respond, so somehow the OS was disconnected from the hw buttons. Changing Zune into serial in the end helped reboot eventually, after which the hw buttons are working in good order again.
Nokia Lumia 800