This is a new one on me, and from the sounds of it was a new one on the Tesla support person I talked to. Thankfully everything on the car continued to appear to work normally, and Tesla couldn't see any problem from their end. Yesterday we were driving from Palm Springs / Quartzsite to Kingman, in 38-42C (100+F) in Range mode and being very comfortable in the AC the car was providing us. 15 miles out of Quartzsite we ran into (not literally) stopped traffic on 10E because of an accident involving a pickup towing a trailer full of hay bales, and a Fed Ex truck. We stopped, and sat for 1hr 20 min before traffic started moving again. We left the car in Range mode throughout, with AC going. Once we got to Kingman, I plugged in and everything looked normal at first. But quite quickly the following popped up on my display: "Vehicle Systems Very Hot. Charge Speed Reduced" (see pic). I phoned Tesla service, they suggested unplugging, powering down the car completely, wait 20 sec, then power up and re-start charging. No change - message was on there immediately. Rebooting both screens didn't change anything; no other outward sign of problem so we continued on charging to get our planned amount and left for Laughlin. It was about 10-15 minutes down the road at ~65mph that suddenly the warning message cleared and ... Bob's your uncle. There didn't seem to be any other option to actually try to deal with the "overheating". I felt powering down and waiting a while would be worse because then the normal cooling would also stop. I had just had the sound insulation installed to quiet the AC, was wondering if that kept some heat in as well. Things in the frunk were quite hot once we stopped. I've never seen this mentioned on TMC and a search only brought up a Roadster. Any comments?