Plug-ins used by the Symantec Management Agent are in a state where they continually reinstall. This has been seen with the Package Server agent and Software Update Plug-in, however it could be any Plug-in
The causes can vary, but a couple of examples could be.
Isolate the policies, tasks, GPO's etc that are causing the behavior to occur.
This is a test for the SMPDiag.
SMP 7.0, 7.1, 7.5