Has anyone filled up their MC200? Now, all my Import CD and Import Files never complete, getting stuck at "Waiting to Copy (album name) ..."

I have deleted all my Grateful Dead and all of my beloved John Coltrane to make room, but I still can't import into the database. The backup I have done to USB drive takes up 437.07 Gb of disk space. It would seem to still have about 62 Gb left but I can't save any new albums (and 5 arrived in the last two days!)

Any suggestions?

Primary: 818v3+ID41, M6 stereo pair, M SpeakerLink cabling, Sonos+96kHz Cullen, silver DSW
HT: Marantz prepro, 271, DSP3300, 8K SE FL/FR pair, DSP M6x2, DSP320x4 (ceiling), black DSW, 520 RL/RR rear in-walls
Living Room: G65, 640 L/R in-walls, UHD722, MS600
Vac. Home: G61, HD621, 4xDSP3100, DSP3100HC
MDMS:NUC/ROCK+TrueNAS Core 12.0 ZFS file server