I've been experiencing occasional short cycling of my A/C compressor (turns on/off quickly several times in a row) and Nest senior support is speculating that my common wire may not be properly grounded. Again this only happens intermittently and seemingly random. My HVAC checked coolant levels, coils, etc. All are fine (A/C unit is 6 months old). I've also tried another thermostat (Emerson Sensi) and still has same issue.
Here are pics from the Goodman furnace control board. I do not see any wires screwed into the chassis. Not sure if I'm looking in the right place.