Attention. The application concerns the Archer AX80 model (it is not yet in the selection "model" form)

Time Machine worked fine for two days. Currently Mac-Mini cannot make another backup.
I get an error in the "Connecting to Backup Disk" process.

Now some information:
1. The settings in the router have not changed since the original and working configuration for TM
2. To be sure: despite point 1, I disconnected the TM, connected and configured again. I entered the password to access the disk and, when prompted, the password to the encrypted copy on the disk. The drive has been re-mapped correctly under macOS.
3. Unfortunately it didn't help.
4. Restart, reconnecting the ssd, does not help either.