Built this house 10 years ago and never had any sump pump problems till the last few weeks. Sump pump works but the float switch seems to stick sometimes, I can't examine it without cutting the pipe and pulling the whole thing out. Sometimes it works fine, other times it will stick slightly and an small jingle with turn it on....so I installed a water alarm as a stop gap measure. So are these stuck switches a common problem and are they fixable or should I just pop for a whole new pump and not trust the old one?