My 3808 is up to date(the latest FW just came out a few weeks ago) and it still suffers with those 2 discs. I haven't watched many Blu Rays nor DVD's since the local Block Buster went under so I do not know if any other recent releases have this same effect; running the player with PCM output solved the problem and I haven't looked back.

Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70