As I mentioned, this is a problem with 24 bit flac files. All my music is in flac format. The cards are 64 GB A-Data class 10 bought from a reputable brick and mortar store and defect free. when i had earler problems with 24 bit playback, I deleted album art from the troubled albums. The HD tracks files have embedded album art, but I don't know the resolution. I use Linux and don't have tag reading/manipulation software installed.
I'm not a Linux user so can't give direct help, but many media player / manager programs allow you to edit tags, including artwork so there's bound to be an easy way to do this on Linux with just a little searching