Spotted perfectly on a CW signal, I narrow the BW from .15 to .10. I hear a click and the audio suddenly drops to about 1/3. S-meter reading stays the same. It didn't do this when the radio was new, but it has been doing it at least since FW 2.78. I now have 2.82. My narrowest roofing filter is . 5. Anybody know what this is about? Windy KM5Q K3 #764