I've been experiencing this error, and it is NOT a thermal issue at the EVSE.
Started charging last night at 35%. Everything started at the ambient temperature, 97 F (Houston)
Charging temps after five minutes:
Tesla WC: 109
Cable: 98
Plug at car: 125
NACS/CCS adapter: 115
Car receptacle: 108...
I'm seeing this issue now as well despite not ever seeing for the first 6 months with the same charging setup. It's summertime and very hot in the garage.
Does the Rivian display have any sort of data logging that would shed any light on this error?