It has been mentioned on this forum that the NEMA 14-50 isn't designed for repeated plugging and unplugging. For the record, it doesn't matter if you plug and unplug it. They don't last. I've maybe unplugged my NEMA 14-50 half a dozen times since buying the car four years ago. And look what I discovered this week: I'm going to replace the plug right away... but I think I'll replace it with an HPWC.