I'm also having this problem, never had this before on older versions. I'm using last BETA (777) available.
To recap my steps which reproduces this:
- Copy a bunch of files to the cloud
- In the middle of copying these files to the cache disk, the cloud drive disconnects.
- CloudDrive tries to upload the stuff I copied but the disk is unavailable (not visible in explorer) and I can't detach/reattach because there are files to be uploaded
- Bunch of "Error getting write requests from driver. The system cannot find the file specified" in logs, keeps spamming it until I reboot the system.
- Solution is to reboot system and after it, clouddrive tries to recover the cloud disk.
To make it short, it's almost impossible to upload a big stack of files since there's a good chance of this to happen.