Another school of thought is that you may also be hitting bad sectors on the drive or some sort of drive failure coming along. If you don't already have an External Hard Drive (EHD) get one, use it.. back up stuff you don't want to loose ... also backup your timers (unfortunately the 722 doesn't have the smart remote controller timer backup that the 722k has)... one way to back them up is go to DishOnline and print out the timers page.. then write in the specifics if needed (or copy that page, paste it in word and edit it from there).
Now .. Outside the drive issue.. the skip forward to live suggests to be drive failure.. *pause and skip back* however is different and has been majorly nasty on my 722k.. up until recently, after the Dish / Tivo settlement ... there was an update or two and the pause/back/skip issue was still there, but didn't seem to go as far...
The worst I'd ever had the "skip back" was in trying to step through a gun fight scene in the movie Ronin. When watching live .. the first time it skipped back 10 minutes.. and then each subsequent time it would skip back to the *exact* same spot .. which meant it went back 10 the first time, 12 or so the second.. 15 .. 25 minutes.. as I'd get to the spot I was trying to dissect with frame forward/backward ... and back it would go after I'd try play from pause. The most I've had for jump back since then was about 2 minutes. The guess is that the markers the DVR uses for chapter/time blocks was much bigger before the Tivo settlement.
Anyway.. get an EHD to be prepared .. no cost to activate ... and a 1TB drive is under 60 now 2TB around 80 .. etc. a worthy investment.