Warning Radar Antenna Disconnected F1

I have been running my ALP / Net Radar since 2016 with no issues at all. Love it and have it in both cars.

I did a firmware update to the 558 and now get the error message Warning Radar Antenna Disconnected F1.

I do not have GPS in this unit.

I'm running an StiR unit and had a similar problem a while ago, though give this a try anyhow;
The cable connecting the RG unit to the main ALP CPU unit switch it round and try bending it back the other way, since doing that mine has been fine, and if you can avoid harsh bends in that cable.

Thanks, I will give that a try.