Problem with CP370 and E140W

[cwhite6]

I am not using a switching box. If I change them over, I turn off the CP370 by a dedicated switch for it and let it shut down. After it has shut down I unplug one transducer from the CP370 and plug the other one in. I then power up the CP370 again. I added the P66 last year because I thought my M260 was broken since I get losing signal from it or it would quit reading bottom. But, the P66 is doing the same thing. I generally do not switch the transducers when fishing. We typically fish for around 12 hours from leaving the dock to returning and sometimes do over night trips. The machine will work fine and then just quit. For example, on Thursday we left the dock and and fished/ran for 6 hours. Everything was working fine and then I lost bottom and the screen basically redded out. I shut the whole system down including the plotter, switch the transducer, and powered back up. Worked fine for a little while and then quit again. My boat has a dedicated house battery that is charged by my motors through a ACR. Voltage on the system never drops low. Usually above 14.1V.