Temperature error in C5's

Running a few C5’s in Colorado. Just upgraded to 2.2.0 on all the C5’s. Our syslog server is now seeing a ton of messages like:

Koch Mimosa_C5 301423xxxx TempWarn - Core temperature -2© is outside the safe range of 0 to 110.

Either that radio is going bad or the software is having trouble reading the temp sensor. The radio on the roof right next door that radio is showing 32© as an internal temp. The trouble radio shows -2© as an internal. Should I be concerned?