Denon dvd player freezes in the same place on certain dvd's also sometimes willnot start to play disc unless re-inserted several times. Model D-M51DVS

Sounds like its stoping during layer switch, if the player is old its needs to be cleaned. its best to clean it once every 20hrs or so. if you do not have a disk cleaner you should go buy one first. if the player is new return it and get the best dvd player you can buy for any amount the toshiba xde. this player is phenomenal, the best you will be amazed. no i dont work for toshiba but ever since they started making hd dvd players(i know they stopped)there players have become the best. trust me if you dont think so just return it. no harm done. if you want a blu-ray get ps3 I dont like them either but i have to admit after buying (for movies only)my third blu-ray player it is by far the best one. almost as good as the toshiba on standard dvd playback but not quite. good luck.