[haus]

Lots of my WM phones have done this from time to time. Fiddling with the backlight settings in the registry (deleting the locklevel folder, I think) seems to help now and then. Oddly enough, though, this has never happened to me on the TP2, out of a long list of phones.

If you're desperate, I wrote a mortscript over in the Intrepid forum that handles backlight auto-dimming problems on that phone (much worse than anything I've ever experienced)...you can find it in my tips and tricks thread over there.

My guess is that something you installed is messing with your settings and causing a conflict. Prox sensor only works during calls on a stock setup, not just out of the blue.