Finicky graphs

Having issues with my graphs rebooting when I crank the big motor. Also sometimes when idling or running or doing nothing at all. Rockwall marine put in a bigger fuse and a new cranking battery but the problem remains. Has anyone had this issue? Solutions?? I'm thinking I may need to go to higher end cranking battery. Currently running innerstate. Thanks for any advice.

Also does anyone ever use a dedicated battery for their graphs?

Its definitely a low voltage situation,have your charging system checked (stator,rectifier)and the new battery as well,two kinds of parts and such go bad,new ones and old ones

Connect the sonar unit's power cable directly to the cranking battery.

the wire to graphs is to small. when the starter engages it draws the volts/amps from the small wire causing your units to shut down. pull 10 or 12 gauge wire from units to battery and problem solved.