Mines like yours, has auto shut off when water flow is low. I went out to check van and noticed the pump was cycling strangely, could smell a slight burning rubber smell then it just died.
That was after about 3years use.
Opened it up and the capacitor had melted, was a bugger trying to find the same one online but found it eventually.
Popped new one in, very easy, pump works fine since. That was a year ago