RM8.2.7533 Issue with Actions being removed unexpectantly

Have upgraded to 8.2.7533 in December and we are having random issues where an action has "disappeared" from the record.

Two instances in audit trail when the action appears to have been deleted, however the user does not have permissions to work with actions.

The other instances is where the due date has been updated.

Our Vendor and HP are investigating the issue but would like to know if anyone elese has experienced issues with actions in 8.2

On WIN 7/OFFICE 2010