2016 Edge Titanium, FWD, 2.0L EcoBoost (leased new for 4 years and then bought my lease). Always serviced at the dealer, no problems, change the battery myself about 2 years ago. In the winter I have a digital charger and used it occasionally but not in the summer. Went out today shopping, stopped in few places and in my last stop when I went to start - no luck, says something like "...power is off to conserve battery....". Friend suggest to boost and did it and started like new. Saturday today so dealer is closed but planing to go on Monday. Car is always parked inside my garage with all doors closed and windows open. Any ideas to trouble shoot myself? Thanks