Problems with version 12.8.3 iTunes on my MacMini OS 10.13.6. I've increased the memory to 16gb and reset the system, cleared the cache, etc. All connections and increased memory show operating optimally. iTunes now seems to be running slower than it previously did. I've attached two external drives (1 primary, and 1 backup) that contain 1,200 plus music-only CDs. Currently, all artwork and liner notes are contained in a separate folder on the MacMini itself. Previously, the artwork would connect with the music on the hard drives. Now the artwork does not always connect with the music contained on the external hard drives. Whenever I attempt to load/rip new CDs now, the artwork does not appear. Checked the ethernet/internet connections, and the MacMini is properly connected to the internet. Also, when attempting to import new CD music, it skips over some of the tunes randomly. The CDS will play fine, but importing seems to be a problem. Can no longer put together any new playlists. Now when attempting to play music from the existing playlists, some songs skip - from both drives, and not always the same tunes.
I will completely delete the current version of iTunes, and download version 12.8.3.1 as referenced by bogdawn. And if that does not work will let you know. Will appreciate continued suggestions.
HAPPY NEW YEAR to all, and thanks for all your recommendations.