Have tried everything I could think of "including calling support". My UMC will initially ramp to 40 amps (once) then throttles back to 10 amps within a minute or so on multiple 14-50 outlets at different locations. Charging at 7 - 8 MPH. is not going to cut it! On most recent plug in "tonight" it would only ramp up to 10A and the car won't let me raise the amps. on the main screen??? It did work "once" @ 40 amps. ( it ramped up on it's own ) while I was on hold with Tesla service who told me when looking at the car there were no faults but that the pack temperature was "on the high side" ?? But now that I'm home .. same result, only getting 8mph 10amp charge rate off of a "known good" 14-50 outlet with my UMC. It should be noted that my Clipper Creek has no problem sustaining max. output "30amps" to the car and the car likes it! (off the same outlet). My UMC is still plugged to the car currently showing 241V @ 10Amps ??? What gives???