Just bought my Tosh 220. Got it home, put Blade II that I rented from Blockbuster in. All looking and sounding great, but about half way thru it jumped a bit, then ground to a halt. Wouldn't FF or rewind, or play or anything. I stopped it, checked the disc and it looked to have a big dirty fingermark on it, which I cleaned off. It then seemed to play fine. Is this what dirty DVD's do, or is it the player? Or is it Blockbusters crappy DVDs? Since it's the first one I've played on it, I don't really know what these symptoms mean. Anyone?