Tag Sources/Cover Art Errors

Suddenly the Tag Sources/Cover Art server seem to be throwing back errors to MP3TAG.

The Amazon servers seem to be throwing back "400: Bad Request" errors for everything (including searches that I know worked only about 6 hours ago).

Maybe another attempt by Amazon to stop non-browser clients from accessing anything on their servers perhaps? As I know how stupidly "protective" their policies are.

Discogs shows "401: UNAUTHORIZED", but I know this has always been flakey at best.

MusicBrainz is actually working (mostly).

No problem here.
Check your system date and time whether they are correct.
Maybe your bios-battery is empty.