Question about Denon 2910 read errors


I just got this unit from ebay. Sounds great and I love it. But it seems to be overly sensitive and has problems playing some of my DVDs and CDs. My budget DVD players had no problems reading any discs.

Is there anything I can do about it? Any repair services out there to fix this problem? Can this be easily fixed?
spareribs
Some players are just jinxed. Doesn't matter what brand. The seller probably sold it for that very reason! Sort of like a 'lemon' car.
Update:

So far, every CD played. If I had a problem, I would turn it off and turn it back on and it would play. It seems to have a problem with burned DVDs but not all of them. I haven't tried original DVDs yet but I assume it will have better success in reading.

Soundwise, it's excellent and working.
My Denon 3910 sometimes has problems reading certain burned CDs made by one friend in particular. If I import the songs CD into iTunes and burn a new CD, then my machine reads the new disc without any problem.