I live in the Phoenix area. My wife and I bought our Terrain in March of 2019. The auto start/stop worked fine until the weather got hot and no longer functioned until the temps in Phoenix dropped back to where the feature would again function as it should. Around November the weather was again back into 80's and the start/stop stopped working and until we had the time to get it back to the dealer it was now late 2020. The dealer told me that because I did not put enough miles on the car to charge the battery correctly the start/stop would not work. They must have at least charged the battery because the start/stop worked great for one day and is now not working. I know from web discussions people would rather have it not functioning at all but I guess I want what I paid for! The service writer explained to me that the battery was an "Absorbent Glass Mat", AGM for short. It was picked because the newer technology battery was better because it was a deep cycle battery. My Question is if I don't keep the battery charged enough to to have the start/stop function correctly how long before the battery goes dead because of my infrequent driving habits. Anyone else having similar problems and that could help me solve this problem?