PS3 suddenly skipping during movie playback? Help!

[cinemaphile]

I have a PS3 slim and have ever had any problems with it.

Yesterday I tried to watch a blu-ray and it was skipping all over. In the middle of a scene it would skip to the next chapter, or skip back to the beginning of the current chapter, or both. Every couple minutes it would do this, jumping all over the place.
I checked the disc and it is completely clean, but I figured it must be a disc problem and planned to return it ...but then when I tried another movie and it did the exact same thing.

I have never ha this problem before, but with it now happening on multiple discs, I assume it's the player. Any ideas? Something I need to do, or is it shot?