LDN - Luminis Developer Network

For the last three weeks our graph of logged in users has been showing unusually high counts.  We would normally expect to see counts of 600-800 users during the day and for it to drop off to less than 20 around 4 a.m.  Lately we've been peaking at just under 4000 and the numbers lately haven't dropped below 700 even at 6 a.m.  It seems like sessions aren't being cleaned up, although I do see timeouts and logouts in the session.log.  Right now we have session.timeout set at 25 minutes.  Our SSB timeout is set at 30 minutes and UserSessionManager.SweepInterval is set