The Sound Skips

[Cyber Akuma]

Lately, almost every psx game I burn has had skipping movies and sound, just what could possibly be causing this?

I recently got a new cdrom drive, an ASUS5224A, could this be the problem?

Also, now I am using Alcohol 120% to burn, could it be this program thats messing up my problems?

It cant possibly be the speed, because I am burning them at only 4x, so what is it that is causing the skipping? And is there any way to stop it?