Sensor error radar 0:9

I'm pretty sure I've seen this in another thread and it was Radar interference. Do you recall what you were riding by when this came up? 

Nothing springs to mind. It's a route I've done many times before without seeing this issue.

Not being a radar expert, could this be caused by a radar on a following vehicle?

I'm having the 09 error since the 8.68beta of edge 530. Before that never, now twice a week on the same track.

It is correlation and not causation, but its strange that since the beta phase more people in my neighbourhood are using radar stuff.

The same as myself, since the beta I get the error. 

I first saw it on 8.63. Now running 9.10 and my wife got the error today on her Edge 530

Never seen during 2 years and since 9.1 FW, it pop up too !

I can affirm, once every ride, 20 minutes from start more less.