NEC 3500A problems

I have been having trouble burning audio cd’s with my NEC 3500A. Liggy’s newest fiirmware 2.98 didn’t help anything so I am starting the think the drive is failing. I use Nero 8 to burn audio at 40x with Verbatim 52x cd’s. Last time I had a problem it was because of alcohol 120 but I have long since deleted it.