Moved their MAS folder from the system drive to a secondary drive with plenty of free space. Network drive now has 25% free space which should be adequate to manage system functions. After moving the folder, I migrated them to v4.5.3. All was quiet yesterday.
Today, the errors (various file not found messages) came back. When clicking on the information button, the panel just disappears. Several users have commented that just prior to the MAS error, they get a Windows notification that the network connection was lost. To me, this would lead one to think that their switch is the issue. They are also running Symantec End Point AV. It appears that they have excluded the MAS extensions, but they are running the heuristic monitoring. Since Symantec has been running for a while, don't think that is the immediate issue.
Thoughts?