Try swapping DVD players to troubleshoot the problem.

With my 3rd generation Toshiba (several years old) I had 1-2 second drop outs on all my digital connections but not using the r/l connections. The drop outs were random.

I swapped DVD players (more recent sub $200 Toshiba) and the problem was solved...and has been for a couple months. I put the other DVD player in another room with regular connection and it now works great, too.