Strange problem

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I was thinking that, but I'm sure it's not. I've installed stereos and speakers often, and I'm quite thorough checking connections and making sure noting can ever come loose. After reading other nissans on other sites with similar issues, I'm thinking maybe it could be the battery? I bought this car from Carmax in February, and it seems like they did no service at all to it, so I'm thinking it still has the original battery since there was only 38k on it when I purchased it.

Another reason I suspect the battery, my headunit is an android joying unit. I noticed that it doesn't always power off with the car, and that's one thing I can't seem to figure out. But maybe that has caused my battery to drain significantly and wearing it down?