Hi John,
I am glad that you B2 is now back to normal, you did not indicate in your original post that the problem had occurred before and was intermittent.
I not from your setting screen that you have 70 WAV files. I think it would be a good idea to set the B2 to compress these to FLAC like the rest. While this is happening please leave the B2 alone to complete the job.
Also when using the B2, do not ask it to do 2 things (or more) at a time.
If you are ripping with it just do the rips, do not listen to music or radio at the same time. If you are editing stuff, just edit, do not play music at the same time.
When ripping, rip in batches of about 30 CDs then leave the B2 to compress these and after compression finishes make a backup (Export to USB C or A) of your work (Export is incremental).
When you have used you B2 to do anything other than play music (including compressions) power off your B2 by pressing the Play/Stop button and holding this in until "saving" appears on the front display. You can power off the B2 after
the time reappears on the display.
To get the music that has got on to the SD Card into its proper place use the front panel menus to set to "settings" and use "get recordings"
I would also recommend you regularly do a "Scan Disk" after a compression run, the above move, any editing you do. After do a "saving" shut down.
Fred