Vantage 8.00.811B - PO Suggestions magically disappearing

Can anyone tell me if there is a log file that would tell me what
Vantage modules (PO suggestions, Part maintenance, etc) have been
accessed by Vantage users? I have a major problem with some PO
suggestions vanishing then re-appearing after i re run generate PO
suggestions which is making me wonder if someone is deleting them.

Thanks,

Jason.