SMB not active from time to time after power on

Hello

After this RN102 was updated to 6.6.0 we sometimes have SMB access problems. This device is powered down every day using the internal timer service and is powered UP every night for backup purposes. Most of the time the readynas works all right but from time to time, no SMB access is possible. I have to connect to the GUI and go to parameters and I see there the SMB button and of course it is grey. I have to turn it to ON and it turns to green. SMB is operational then and the shares are available from the Domain.

I cannot find any problem in the logs (smbd log says: STATUS=daemon 'smbd' finished starting up and ready to serve connections)

This Nas uses AD for users and is connected to a very small domain, it has no add-ons, no cloud, and no exotic parameters, tested with or without antivirus,

Only internal scheduler is used every day for shutdowns on power up.

Have you any ideas of the problem and how to fix it, I don't want to revert to earlier OS as this is too much of a hassle.

I cant sent the logs if needed.

Thanks for help.