[CA] Radar not picking up targets or waypoints

I have a Raymarine T92182 HD Dome. Mid fishing trip my radar stopped picking up targets (land and moving) as well as waypoints from my chart. I can here the unit running and have a green flashing light at networking switch. I've checked connections and all seem fine. The motherboard on radar was replaced three years ago. Has worked fine since. Thoughts?

Capt. Steve