I've been having problems with my DC..

[Subsect]

on two of my burnt games- Ooga Booga and Alien Front Online...ive been getting alot of skipping and lagging from my DC. for example, in Ooga Booga, during each players intro, it lags and skips for a second or two at the exact same spot every time, and often during the game it will just freeze for a sec, and it gets very annoying. it even locked up on me the other day.
and on Alien Front Online, i have insanely long loading times before each new screen, and it always skips the music track right after its finished loading for about 2 seconds. however, there is no lag or skipping during the gameplay.

any idea what could be causing these? bad dumps? crappy burner? none of my other burnt or real games do it, so im guessing its something with the ISOs and not the DC. well anyway, please try and help me with this, is getting frustrating

p.s. whats the Alien Front Online 60Hz patch do? and the Cannon Spike LBA patch?