I just got my car and had a 14-50 put in with 50 amp service, which works out to 40 amps continuous. However today I noticed that while it runs at 40 amps for a while, pretty soon the car turns itself down to about 34 to 30 amps. What are some of the reasons this might be happening? And more to the point, what can I suggest to my electrician as to how to solve this?