Has anyone every had a problem with the LCD on their finder fogging up? I have a Humminbird 535 that I've sent back for warranty repair twice now and it's still doing it. Is this normal? When it's cold out it seems to be the worst. The screen will get condesnsation under it and it's hard to read, and if droplets of water land on the screen, they will also get fogging rings around the droplets.