Ever since we upgraded to RE 7.91 I've noticed that our exports are taking excessively longer to complete (I am still trying to run an export of 26,000 constituents for the past two weeks with no success) or during the process they are terminated due to a resource deadlock or encounter a different error.  Larger and smaller exports work fine and it appears to only be this one group I am working with.

 Any ideas or suggestions on where to find a solution?  I already checked the knowledgebase to no avail.

Philip - Sometimes queries/exports become corrupt for no apparent reason...have you tried recreating the Export or the associated Query?

I'm having the same issues since upgrading.  An export of 2000 records takes 4+ hours.  Recreating the export hasn't helped either.  Never had these issues before the new version.