If you will trailer down here to Richland Chambers, I will teach you the settings and what they do, use, and how to interpret your echo returns.
I have run a number of individual classes this summer and the response has been great. A two hour class on your boat is $100. PM me with a phone number and I will give you a call to discuss options.
There are a couple of reasons for the shut off. The unit needs a strong consistent 12 volt supply. IF it isn't wired directly to the battery that can cause it to turn on when the voltage drops due to a decreased flow. If you boat has a battery cutoff switch, you can wire into it. Most likely, I recommend running wire directly to the battery and then putting an on/off toggle switch inline and on your console. This allows an absolute off in addition to the sonar off, to prevent you from accidentally draining the battery.
Capt. Craig Copeland
Licensed by the US Coast Guard
2013 Nautic Star 2110 Shallow Bay Boat
Humminbird HELIX 12 CHIRP MEGA SI GPS G2N
Nautic Star Boats Pro Staff (nauticstarboats.com)
Redneck Fish'n Jigs Pro Staff (redneckfishn.com)