User dropped from User Group

Hello,

We have BOBJ 4.2 sp06. I'm having users that seem to be dropped from a user group without any sort of activity on their user security and memberships. The users and user groups vary. It's always single users. Others users with the same exact config are fine.

Example

A User belonged to two groups (say HR and Finance) that are assigned to two separate folders. Today she emailed me that she couldn't see the finance folder. I reviewed her account and she was no longer a member of the Finance group. I queried the CMC and audit databases but I don't see any activity on her account or the Finance User group. There are only two of us that admin these groups and we didn't touch it.

Could this a database issue?