elucubra

Ok, you may be facing disk rot. Disk rot is much more prevalent on self recorded that commercial recordings.

ddrescue is probably your best bet.There are other options, but I’ve always had the best results with ddrescue. There is no way to fix disk rot.

Quick question, are these burned blank disks, or purchased commercial disks?

ddrescue.

Also, maybe look for a CD lens cleaner.

May be hard to find nowadays. An alternative is gently clean the lens with a Qtip slightly moist with distilled water, and dried with the other, dry end.