I have been using the HTC Magic with the updated HTC Sense UI for about 6 months now. Recently, whenever I use an app after a few minutes it will just close. The behaviour is erratic and does not always happen but sometimes it will just close. It doesn't give the message that it has crashed but it just quits completely. This happens to built-in apps like the Market and Gmail. Nothing has really changed although I have installed/uninstalled a couple of apps. Nothing that should affect this though. Any thoughts?