My vacuum pump has been having a delay when I turn it on. When it flip the toggle switch, it takes about 10 seconds or so before it kicks on. This doesn't happen every time, but most times, and is a newish issue that started happening about 6 months ago and has progressively gotten worse (used to delay for just a couple of seconds). I am assuming this is just an issue with the switch, but maybe not? I'm worried that very soon I am going to try and turn it on and it won't work. Any thoughts?