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Hello, my name is***** will assist you.
Attached is the manual for the unit. You should set the bottom for automatic range, this will provide the best coverage when changing depths. You could also be zoomed in and that is why the top number is *****
For the power, I would look at the fuse box where the units get their power. A dirty connection there can cause the units to drop out. They also require at least 10V to operate, so if you are fishing for some time with both units on and live well pumps, that can actually drain a battery pretty quickly.
Is the transducer bottom clean, and is it sitting parallel with the bottom of the hull? Not pointed up or down?
Scroll to page 12 of the manual I sent you, that is how it should look.