Does anyone have experience with listserv either hanging up or crashing hard after sending a query to the DB?  We're on 15.5 on a linux box, connecting via UODBC to a MySQL DB on the same machine.  Sometimes after sending a query to the DB, the lsv process becomes completely frozen, requiring a hard kill of all the processes before restarting.  The most puzzling part is that we've been unable to reproduce it.  We'll try the same action again after restarting listserv, and the query returns just fine and everything continues as normal.  The only common factor at this point is that the crashes have only happened while updating our list config files to use a DB query, and not during an actual mailing.  Other than that, we can't find a common cause.

Does anyone have an idea where to start looking?