What's wrong ??

The problem is when i try to boot dvd games, When my machine i cold it works fine(sometimes..) but after a few hours of gaming the ps2 starts to make clic noises and even worse the game will stop, often when there is a cgi scene with audio the sound repeats itself over and over. It has been like this since day 1.I have tried lots of different media with no luck. i also have a old ps2(V3) with a messiah chip, even if its old this machine plays my backup games way better than my new. I have a Ripper gold chip installed in my new ps2(v9 or10). The guy who sold me told me he could replace my laser and that this would do the trick, but since i now feel that i have lost 430$ for my premodded ps2 i am gettin sceptical to giving another 100$ for a new laser.

You guys are the experts, will a new laser solve my problems or should i just buy a new pstwo from a different "chipper"?