need help with my humminbird 565
i put this unit on right at a year ago it done fine all summer, the first time out it done fine for about 20 min. then i notice something was wrong. it would not show the bottom, no structure,and no fish. themp and depth seem to work. i have a matrix unit at console so i took 565 screen off and plugged it into the matrix and it worked fine. then i called humminbird and told them what was going on. tey said transducer, so i recieved another transducer from them fridaynight at 8:30 p.m.,,mounted it to trolling motor and went fishing sat. and the same thing even the matrix unit will not work right. at one point and time it showed i was in 539ft. of water when i was only in about 20ft. any help from this site would be really appreciated..thanks