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Original Roadster wall charger goes into Ground Fault

I have the original wall charger that came with my 1.5 Roadster and it has worked flawlessly for the last 15 years. I just had some work done on my Roadster so was not using the charger for ~6 months. When I got the car back and plugged it in, as soon as you tell it to start charging, the charger immediately goes into Ground Fault. Every time. I can charge the car with the 110 volts adapter, slowly, but not at high speed.

Has anyone seen this behavior before?

Thanks for the several suggestions I received! Resetting and power cycling the charger itself did not fix the problem, but turning off and on the circuit breaker upstream from the charger did fix the problem. Maybe I took the wrong EE courses in college, but this seems a little strange. But, I am happy with the result.