Was having same problem over a period of weeks. Mobile service tried new charging cable (one that came with car). That didn't fix it. They then suspected it was the 14-50 outlet. Electrician checked it. No problems. They brought me a loaner (also an AGT) and trucked mine to service center...
Mine has been doing same thing for 3 weeks. Never had problem in the year I've owned AGT. Car stops charging when it goes to sleep. Wake it up and it starts charging, till it goes to sleep again. Mobile tech has been out. Gave me a new charging cable to try. Didn't help. Waiting to be...