HELP, 812s@832s(CG5J) - a lot of pops-clicks when burning CDs

I have a 812s@832s with f/w CG5J.
Everything worked fine till i noticed lately that when i back up audio CDs i hear some “hiss” ,“pops” “clicks” instantly on the burned disc.
Any ideas what is going wrong and how to fix this problem?
If i go back to an early f/w will that fix it?
Please help me people!!!