That doesn't sound like a settings problem. It sounds like the player is having trouble reading the disc. Maybe the discs are dirty or damaged. I've had the 820 for a couple months now and have never had a single problem playing any disc. The cheap Philips I was using previously would get...
"Blocking" is far too general a term. You need to describe it more completely or we'll just end up guessing what the problem is.
It also sounds like it could be a motion setting on the TV that should be off/lower. A lot of processing adjustments cause more problems than they solve.
Usually the Brightness setting. You could pause a menu that has it, then lower the brightness until the blocking disappears. Then just see how things look.
Ah! Definitely could be a black level that is passing “darker than black” levels. So, it would be the calibration of the TV. The best solution is with a calibration disc or pattern to get the black level right.