I set my screen timeout to, say, 1 minute through Settings-->Display-->Screen timeout.
Immediately afterwards things are fine and the screen times out as expected, but some time afterwards, after I have made some other actions with the phone, ie general use, the OSD seems to 'forget' that I set the screen timeout. So then, if I leave, say, the gmail app on the screen, the screen does not time out and just sits there lit up sapping battery. I'm not sure whether it's just certain apps where this happens, but it seems random. It also sometimes happens with the home screen.
Am I missing something, or is this a fault with my phone? I've had no problems like this with my old T-mobile pulse - it always times out and turns the screen off.