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NI 9481 relay overheating?

I'm controlling an NI-9481 relay switch with Labview 2010. The setup is controlling a battery charging / discharging system based upon feedback given by a Voltech power analyzer. During the charging stages I'm getting intermittent relay drop-outs where the channel appears to be opening for, say, 5 or 10 minute intervals and then closing again. It's driving me crazy. When I'm closing 3 channels the behavior is different than when I'm closing 1 channel (3 channels opens quicker and stays open longer). This suggests an overheating condition of some sort. Is this a physical possibility with that unit and, more specifically, is this something that others have experienced? I'm almost certain that the problem isn't in my Labview code but "you never know"... Thanks so much
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Hello Rbeery,

 

 

Can you check  that during the operation of the 9481 none of these parameters are exceeded??

 

9481.jpg

 

Regards

 

Mart G

 

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