so out of nowhere I turned the key and nothing happen except a slight humming noise...turned key back tried again and same thing. After a couple of tries it started (Weird). so now every time i try to start it it either starts right up or I have to keep trying. When it doesn't start it doesn't even turn over. If it was the starter they just never start again and I just had it replaced 3 years ago. I was reading some other forums and they said starter relay...any suggestions???