Tesla 3, Tesla wall connector and charge hq - setup has worked for some time relatively trouble free. Lately ev showing offline

The problem I am having is vehicle showing off line. Why is it so? I’ve rebooted the vehicle and wall connector and re-paired Charge HQ with the vehicle. Works for a while. The wall connector has needed rebooting lately after years of trouble free operation.
Can you recommend a testing procedure to fault find what is going on?