I have a Nema 14-50 outlet in my garage and have my Mobile Charging Unit plugged in for charging. Recently I've noticed my charging fluctuates from the max of 8 kw to 4 kw. It switches back and forth while charging. I haven't noticed this before and wondered if it is just with warmer temps (Upper 80's - 90's in garage) or is my Mobile Charger becoming faulty.