Yes, I have seen the odd low K band false on the DFR9forNZ. Most of us on the R7s and R3s run Ka segmentation, which the DFR9 doesn't have. I might limit the limit on Ka for the DFR9forNZ. The DFR9 does sometimes report the incorrect Ka frequencies before correcting and adjusting itself. In my video here testing the Ka range on an original US DFR9 you can hear an extra blip when the Ka frequency gets updated (at about 6:00 in the video):Interesting, I assumed all Ka alerts were genuine since it is a restricted frequency, but obviously there's stuff out there to cause false positives.
Yeah, I guess they noted I removed X band on the DFR9forNZ!