Hello, I have a garmin 551s, 2013 model. It has a glitch....it beeps and then the screen goes blank with the writing "trannsducer disconnected", then 30 seconds later it goesn back to a normal sounder screen, measures such as water temp, depth are all over the shop, it's having the similar "screen or data olss on gps, the transducer cable is well secured on these units and the reading is in and out??????????? any advice and what is the warranty on these things????