My Vero is physically linked to my receiver, so they will always power on together, even when not using the Vero.
I have noticed that sometimes the Samba mount has disappeared by itself, while the Vero has been on for an hour or so (with the receiver on Radio or so).
Is there some feature auto-unmounting the mount for some reason?
There’s one here where it seems that smbd (the server process) is getting a SIGHUP when a DHCP lease is renewed.
While it is possibly not related to your case, it illustrates that the issue might not be on the OSMC side. I also see that we know nothing about your SMB server set-up and that you’ve also provided no logs from the Vero4K.
In the circumstances, we have very little to go on.