Loosing libra database


my Volumio keeps loosing the library / database
it worked for some days but then it lost the connection.
it said that the nas was connected but it did not scan.
i thought it was the SSD so i changed to a different one.
now it see the NAS the first 10 minutes in to the scan and then it refuses to see the NAS and scan it.
What i wrong ?
it is a PI4 4gig no DAC

Wifi problem?

hmmm not that i know of
will check