Parallels 12.1.3 With Windows Vista VM Causes MacOS Sierra 10.12.3 to Lock

I have a Vista VM that has been running fine for some time now, but then a few days ago started causing my entire MacBook Pro 15" w/ Touch Bar to lock up entirely. I also run a Win 7 VM that seems to be okay. I have tried various repairs, using the MacOS Disk Tool, the Parallels Disk Tool (prl_disk_tool) and chkdsk within the VM. The first two say everything is 100% fine. Chkdsk was finding some errors and correcting them, and for a while all seemed well, but now it can't seem to even complete a chkdsk before the entire machine locks solid. Everything outside of that VM is working perfectly, and as long as I don't start the VM up, the rest of the machine is rock solid.

Anything else I might try? I'm not sure when exactly I updated to 12.1.3, are there any known issues there that might be my problem? I have tried copying the .pvm under MacOS and just doing that seems to cause similar behavior, which makes me think that even though MacOS and Parallels seem to think it's fine, there really is some corruption in the files (themselves) - it seems to lock when copying the .hdd, despite prl_disk_tool saying it's perfectly fine.

Thanks,
Blaine