I am a new user. I ripper 30 cds to flac and removed my thumb drive and put it in my dac. The tracks sound super. I had a few tracks that were not matched as secure, but not many.

I came back and now 95% of the tracks are coming up with an error code. I put some very main stream discs in so I could be sure there were no bootlegs. I also set CD ripper options to rip direct to final file names.

Ideas?