Mine did the same thing on a previous FW. I was getting close to a stationary locked out speed sign and the unit gave me a quick two beep alert then fades out the locked out signal. Oddly only from one direction..
I'm following a thread on an upcoming R7 update, I saw you there participating. Is there a chance you could mention this idea of a different tone for rear and front detection? It's brilliant and it would eliminate lots of unnecessary glances at the unit when driving.
I tried to participate but...
What I did with my R7 is I applied three double sided 3m strips behind the original suction cup mount and mounted it above my RVM permanently. It's still there since the release of the R7. It holds amazing.
I've also noticed that under 1.29 but....when I reverted back to 1.24 ( factory reset done also ) this issue persisted. At least in my case. I found a few MRCD and K signals repeating themselves even though they were previously marked.