For the past month or so every time I charge my M3 using the CMU (which is the only source I have, using a 14-50 outlet) after about 2 hours there is a flashing red light that comes on the front of the unit. When I check the amp rating it goes from the normal 32 amps down to 12 amps. I don't usually try to charge every day just every other day. Has anyone else experienced this issue and/or is my CMU bad. Any advice is appreciated at this time.