My outlets are regular 5-15 slow charge style. Purchased an SR+ in December. Saw this error 3-4 times but it goes away the next day and charges as normal. The detached garage has 3 outlets, one on each wall, and they all behave the same way, making me think it isn't an outlet problem. The wiring is probably old. I had a guy from an electric company come out and do a quote for a 14-50 install, I asked if the existing wiring was a risk and he said no. I would get 14-50 but it would cost $1500-2000 because they need to run higher bandwidth lines to the garage which requires trench digging. If this error doesn't go away, what is likely the cause and can I fix it myself?