I finally got back in the water after almost a year and was having a great time when i got a loud signal that sounded like a beer can and then everything went haywire. Loud buzz through the headphones that wouldn't quit. Turned it off and back on and still loud buzz. I tried adjusting threshold with no difference. Disc is at 7. Sens is at 7. Battery is at 12.20 volts. I can't see any water in the battery or pod. Any ideas what might be going on? Thanks in advance.