I'm curious, what are your PRL versions at each level?
There is an offsite link that has a M.IP reset/reload type thing that has seemed to help me. When I come across the link I'll post it back here. My phone was doing that after loading dcd 3.2.5. Seems to be back to normal now. Unfortunately not really sure what fixed it and if it is really fixed.
Here's the link:
Look under the potential problems section - like the 4th one.
http://ppc.stoleyour.net/xv6800/