I have a similar issue between a Home Depot Leviton ($8) NEMA 14-50 receptacle and a Bryant ($45) receptacle. I just switched to the industrial Bryant receptacle because my Leviton receptacle gave me reduced current (12A) 3 times over the last 1-1/2 years. I thought it was due to heat so I bought an industrial receptacle. After installing the new industrial receptacle I got a red T light blinking twice. I then switched back to the Leviton receptacle and the Tesla logo was all green. Switch back to the Bryant receptacle again and got a red T blinking twice. Any ideas? The only change is the receptacle. The wiring is the same. Weird.