My Nemo Air is turning on and registering dives when not even connected to a tank. I just came back from the Keys and have 7 dives that were 0 minutes long, with depths ranging from 12 feet to 97 feet. One of my real dives registered the time and depth fine until the end when it says I went to 109 feet. The water temp also is wrong at 41 degrees! The other 12 real dives registered fine. Any ideas on what is causing it? How do I update the firmware?