Do you have the correct transducer selected in the settings on the head unit?
Not sure of the depths you normally fish, but if you're in shallow water putting the head unit in shallow water mode helps out as well
if you're on facebook search for the walleye 101 public page, The guy that runs that organization knows about all there is to know about lowrance products and will help out as much as possible
I had an issue similar to yours, i would just lose bottom and sonar and the finder would flash either 1.7 or 2.3ft. i replaced the transducer and its worked great ever since
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Boatless
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