Errors after unsuccessful mount a network drive

After an unsuccessful mount a network drive, the occurrence of errors in the folder mnt/
It helped only stop service MPD - delete/create folder NAS - and start service MPD
But after this dev/sda1 no longer automatically mounted to mnt/USB, even after a reboot
So i found error, if on NAS Share have many files (aroung 1.5 tb) and when updating the database, the wheel is spinning very long time
Are there any limits on the amount of files on the remote server to be mounted?

there is a stale bug report that volumio can’t handle more than 10,000 files