I have the hummingbird 798, down imaging and side imaging unit. IT's about 2-3 years old. Saturday while fishing, I moved from one spot to another. Upon reaching my next spot, I noticed the screen had locked up and appeared slightly fuzzy as if it was receiving static of some sort. None of the buttons would work. So I disconnected it from the mounting bracket/plug, waited a few minutes and plugged it back in. Now, it won't even turn on. Anybody else have any problem like this before? I haven't had time to go in and try to trouble shoot my wiring yet. Gonna try that this week. Just thought the screen freezing up and appearing to fuzzy was odd.