Lost of (big) CIFS Share

I have been collecting, creating and ripping MP3 files for almost 30 years. The collection includes also through my hobby as a DJ and radio presenter thanks to extensive promotional material about 200,000 titles. Over a release (CIFS) to a Windows10 computer I can also integrate these. While the share is read I also have access to it. But sometime (like with 60000 titles) the share disappears and does not come back. My guess is that the database created on the PI has filled the partition. Since I almost always use 32GB cards in the PI I wonder if it is possible to enlarge the VolumioPartition. Or the problem is somewhere else. I tried the whole thing without WIFI, same result.