Temperature sensor in Connect-IB card (diodes) are located and spread inside the the adapter silicon,and I guess you're in the safe zone as the threshold should be 100 [degrees centigrade].
The assertion failure seem to trigger from the Connect-IB health mechanism checkup, I'd say that it will be good practice to move this adapter to another server and see if you're still seeing this behavior.
it will also be beneficial if you can share you server spec
Cheers.