Not that this has anything to do with your issue, but the Market was updated yesterday and a lot of my apps disappeared then came back. Google's been messing around again. I only know this because I happened to see Lookout scanning the Market and declaring it safe, then Appbrain showed Market as a newly installed app.
Do you move moveable apps to your SD? That can free up some space on the phone (although you seem to have plenty) and maybe clear some memory? Have you cleared cache lately? That may or may not help, but that with a restart may do the trick...dunno...just thinking of stuff out loud. lol.
And not for nothing, what the heck is that stupid DRM protected data crap? haha, it sends a lot of data...