I have google the reason for this a few times. My outdoor speaker randomly turns on at night and rather loudly. I never really found a reason until tonight…… I had a look at my surveillance camera right beside it and found that a gecko
had been running all over the top of it! I tested it out and the softest of motion across the top of the speaker turns it on. Tomorrow we will try flipping the speaker upside down and see if that stops it from happening. This may be the answer to others who have had this experience!