Has anyone experienced issues with the radar not “painting” targets on screen? It started doing this in the fall but would seem to warm up and start working. Now it does not seem to and only marks with the gain cranked up. Antenna or display? And the bigger question, replace? With what? Whole helm is antiquated raymarine. I use the autopilot often, radar occasionally and my iPad always. And depth of course is important.....what would you do?