There are a couple of shopping centers near my house that I use for testing because they have lots of radar sources. While playing with the Expert Meter mode on my 9500ci I have been going to this one particular parking lot because it has at least 4 X-Band sources so the Expert Meter will show 4 X signal bars - at least is was until last night.
Last night I drove to that parking lot and got nothing on X-Band. The usual K-Band false was there, but X was completely silent. That's never happened before; I always pick up X-Band when I drive past. Unfortunately I didn't have my V1 with me at the time.
So tonight I went back and this time I brought my V1. With the V1 turned off, I was picking up 2 X-Band sources. Better than the previous night's 0, but still short of the usual 4. Then I turned the V1 on; its bogey counter immediately registered 5-6 bogeys on X and K. So it appears my 9500ci is going deaf on X-Band. AFAICT K and Ka are unaffected.
In all cases the 9500ci was running in Highway mode with GPS filtering turned off, so none of the received signals should have been filtered out.