I've got a W850 which has a problem that it keeps "resetting" itself.
After about 1-2 minutes after I turn the phone on, the screen just goes white, and then it seems like it turns itself off, but after a couple of seconds, the phone just returns to the home screen.
Also where the name of the network provider is supposed to be, it only says "searching" even though the "network bars" has a full signal.
It's pretty annoying because I can't do anything with the phone, because it just keeps resetting itself.