I fish with a friend who's gps was doing that and it was the cable connector coming from the antenna. Had to put a new one on it . Next time it does it reach around to the back and wiggle it if it starts working then that could be the problem....

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I fish with a friend who's gps was doing that and it was the cable connector coming from the antenna. Had to put a new one on it . Next time it does it reach around to the back and wiggle it if it starts working then that could be the problem....
I agree with the loose cable. I was with a friend and he did not have his cable connected tight. Also you may want to check all of your connections including your power connections.
Nick
