timing out



during a online session some of our users are "timed out". Is there a setting we have missed? here is a section of the log:7/6/2011 10:00:03 AM GenericPlayback Info STOPWATCH1 closePlaybackDevice: 0 ms -1
7/6/2011 10:00:03 AM Windows Audio Session Debug WASenDevice-enter
7/6/2011 10:00:03 AM Windows Audio Session Debug WASenDevice-leave
7/6/2011 10:00:03 AM GenericPlayback Info STOPWATCH1 internalOpenDevice: 34 ms -1
7/6/2011 10:00:03 AM Windows Audio Session Debug WAS::startDevice-enter
7/6/2011 10:00:03 AM Windows Audio Session Debug WAS::startDevice-leave
7/6/2011 10:00:03 AM GenericPlayback Info STOPWATCH1 internalStartDevice: 0 ms -1
7/6/2011 10:00:03 AM GenericPlayback Info STOPWATCH1 openPlaybackDevice: 35 ms -1
7/6/2011 10:00:03 AM GenericPlayback Info STOPWATCH1 closeCaptureDevice: 0 ms -1
7/6/2011 10:00:03 AM Windows Audio Session Debug WASenDevice-enter
7/6/2011 10:00:03 AM Windows Audio Session Debug WASenDevice-leave
7/6/2011 10:00:03 AM GenericPlayback Info STOPWATCH1 internalOpenDevice: 7 ms -1
7/6/2011 10:00:03 AM PreProSpeex Info Speex version: speex-1.2beta3
7/6/2011 10:00:03 AM Windows Audio Session Debug WAS::startDevice-enter
7/6/2011 10:00:03 AM Windows Audio Session Debug WAS::startDevice-leave
7/6/2011 10:00:03 AM GenericPlayback Info STOPWATCH1 internalStartDevice: 0 ms -1
7/6/2011 10:00:03 AM GenericPlayback Info STOPWATCH1 openCaptureDevice: 8 ms -1
7/6/2011 10:00:04 AM Info No TSDNS found at "virtualnavairops.com"