I can’t be sure, but I suspect this may be the cause of the problems you’re experiencing.
FMOD Studio is not compatible with most cloud file synchronization services. It needs to regularly open handles to the various files in an FMOD Studio project in order to make changes to them while you are working on that project, and cloud-based file synchronization services also regularly open handles to the files of synchronized in order to synchronize them, and these two things can occasionally clash.
If this is the cause of the issue, you should be able to avoid it by disabling automatic synchronization and instead manually synchronizing your files only when your FMOD Studio project is closed, or by using one of FMOD Studio’s source control integrations instead of Backup and Sync.