Finally solved my 6800 freezing
 

My 6800 had been freezing very often for the last week or two. It happened the most often when receiving an IM through IM+. The device would just lock up, or the activesync screen would show up on top of IM+ all of the sudden, or the device would not wake up at all.

So basically the fix was removing PocketCM. Has not happened since, whereas before it was happening very often.

Give it a try if you are having these problems.