We have the same unit on Blue Sky.
We had a similar issue, and I was able to correct it by doing a complete reset of the MFD, which was annoying as much had to be rebuilt, such as the data boxes.
Discussing it later with a tech, he suggested that rather than doing a reset, just power down the radar, wait a minute or two, and start it up. Note that this is not just shutting down the MFD but a shutdown of the radar unit itself at the electrical panel.
And on our boat, a Nordic Tug 42 with the radar dome pretty much directly above the helm station, I can clearly hear the radar antenna turning from the helm station once I hit transmit.
Campbell River BC