I should have been more clear in my explanation. The volume shadow copy service hasn't been disabled. It is still set 'Manual' in the services mmc as it always has been. I simply turned off Shadow Copies (via shadow copies tab) for that volume to simplify and streamline future troubleshooting. One less thing to trip me up in fixing things.
We still have 2 other volumes on the file server that create shadow copies... and are not causing us any trouble.
I agree 100% for fixing the VSS errors... I believe MS has issued a few hotfixes for VSS, and I'm unsure if they were ever deployed to this server. That is my starting point. Additionally, the server is due up for regular maintenance... for which we have added a disk/health check to sort out any potential disk errors that could be at the root of this.
*Edit... I just saw Craig's post about VSS update after I posted. We were thinking the same thing.