My KR 2022 Power Boost does the exact same thing - except it is exactly every 11 seconds. Sounds to me like it comes out of the speakers. Doesn't have any issues starting and will start thunking right as soon as I turn it off so I don't think it is from climate control.
Just got a new 2022 F150 KR. All good except the running boards are constantly going in and out every time a door is opened regardless if it is set to "off"/"out" or "auto". I'd rather they just stayed out all the time, running or not. Does anyone know if this can be programmed to just stay out?