Temp Trax not consistent

[Celeste Hilliard]

I have Nagios running on RH 7.3 with MRTG and RRD for graphing.  I have a a
Temp Trax device with 2 sensors connected to the RH box with one sensor in
each server room, with the Temp Trax plug-in installed.  The data being
reported is very inconsistent.  The first 2 weeks of my graph show that both
of the sensors timed out about 4 times that week at approximately the same
time, but it would always recover.  Then I had a whole week that the sensors
did not time out at all.  The next week they started timing out on Thursday
afternoon, and did not recover.  In response, I re-booted the server, and
everything seems to be working again.  Where should I be looking to see why
this keeps happening, and how I can fix it without re-booting my server
every week?  
 
I also would like to know if there is a way I can tell Nagios to check the
temp trax service at specific times of the day or at a different time
interval than the rest of the service and host checks.
 
Thanks in advance.
Celeste

 
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