I apologize in advance if this question has been answered before. I did a cursory search and didn't find an answer, so here goes.

My Crossfire is my daily driver and, believe it or not, oftentimes sits idle all weekend. Twice now when I've gone to start the car on Monday morning, my factory radio turns on. I never leave it on when I shut the car off on Friday, so I am wondering if this is an indication that my OEM battery is failing, or if someone is sneaking into my car on weekends and turning on the radio just to mess with me.

The car is about to be sent to Florida with my daughter for the winter and I don't want to lend her a car with a weak battery. But I don't want to replace it either if it still have some life left in it. I've had no other indications of battery problems like those I've read about here.

Anyone else have this problem?