After standby over night no connection to NAS

Today I tried to access the NAS via the internet browser directly after waking up Fedora from standby. Strange, but it work perfect and I can immedently access to the NAS.

After that I opened Gnome files and got this error:

Some minute later I can open the folder as usual. Without doing anything for that.

I see some failures in journal, but cannot unterstand the meaning of it.

Edit: The connection to the NAS is lost after some hours, not just only over night