Exact same issues! FF/RR not working correctly at all, sometimes rebooting, mostly just freezing.
OK, I just got off the phone with Tech Support at Dish Network -- Apparently they actually received a memo today specifically indicating that if anyone calls in with "DVR Issues with Fast Forwarding or Rewinding on the 522 with Software Revision 4.11" to create a ticket and send it over to the Engineers.. The tech went on to say that they're debugging the problem(s) with this issue now, and that anyone with the problem should call in so they can gather as much detail about the problem as possible.
The tech unfortunately didn't have an estimated date as to when an updated revision might be available that will correct the issue. Darn it.
My 522 dvr recently (just a few days ago) received the version L4.11 software update....With this new software, I am now having serious issues with the FF/REW and SkipFW/SkipBack functions on recorded material. Sometimes the FF/REW goes slow (x60 really only x4), or it just refuses to move either direction.
Today Dish begin spooling L4.12 :
FW:L412, Model: DVR522(total 109) /DVR625 (total 93).
I also noticed yesterday that the up an down channel functions would skip - so if I were channel surfing, it would skip and go up or down very, very fast. I stopped it by pressing up or down again. Not sure if this is related to the other issues... at first I thought it was a remote problem, but now I'm not so sure.