There was someone from the midlands that had the same issue Lexus Carlisle told me and one in the states . It’s obviously a defect in manufacture or age . Whether it’s to do with lack of use etc I’ve no idea . I didn’t use my isf much so maybe sitting in the garage for days each week didn’t help . Or maybe I was just one unlucky ***** to have that happen . Like finding a doe doe eating bird seed in ya back garden .