[makkonen]

You could try downloading the sdrescan app from the market and rescanning the media on your device. I doubt that's your problem, but it's worth a shot. Past that, I don't know what gets messed up that causes the media process to start crashing; I've had it happen, too, and while it sometimes resolves itself, sometimes it needs a complete wipe.

I'm not sure what you'd need to save to keep your sync settings through a wipe. A quick google search suggests Titanium Backup might be of use, but I haven't tried it, so I have no idea.