There could of course be something wrong with the radar itself, which doesn't show as anything but no echo from reasonable distance.
Snow sticking to the protective plate or torrential rain are the reasons I've had for it to be blocked. People who mount auxiliary headlights sometimes place them too high, so they block the radar.
The camera behind the windscreen I had some issues with, when Volvo replaced the windscreen (water ingress, due to bad bonding) and the new windscreen had broken heating wires in front of the camera. The glass fogged up when it got cold outside.
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