Exchange 2010 "Out of page buffers"
We have been running Backup Exec 2012 with all patches as of today (8/8/2012) to back up our Exchange 2010 (also fully up to date) for a few months. Full backups always complete successfully, then Incrementals will run for 2-3 days just fine. After a few days, Incrementals start to fail with the error "V-79-57344-759 - Unable to complete the operation. The following error was returned when opening the Exchange Database file: '-1014 The database is out of page buffers. '". After this happens, the Incrementals fail with the error "The last backup job was not run by Backup Exec" until the weekly Full backup runs. This happens every week.
The Backup Exec temp files are not be scanned by the antivirus, and I can't find anything on the Exchange server that would run at these times that would use extra resources during the backup windows. Circular loggin is not enabled. I tried changing the registry entries mentioned in the MS KB article that discusses Exchange running out of page buffers (don't remember the KB# off the top of my head).
I've also tried modifiying the backup windows (changing the day the Full runs, changing the times, etc). Still happens within a few days. Is there anything that could be causing this, or settings I can change to avoid this going forward?