Lately I have been having a problem with both downriggers. With the downrigger up just sitting there it jerks up about 3 inches them releases back 3 inches. sometimes it will do it 3 or 4 times in a minute. If I go and jiggle the switch it will stop, so far I have lost 2 downriggers balls. Has anyone had the same problem, is this common with Scotty's.