6600 v4.2.20 RX Deaf on Startup Until Bandswitch

I have observed that since the 4.2.20 update, my 6600 is 'deaf' on the band last used before power down - until I move around the bands. For example, the last used band is 80m (FT8 freq). Power off until morning. Power on in the morning, and the 80m band is deaf - the spectrum and water fall are flat, no signals. I can leave it as-is and it will not change, until I change a few bands. Not one or two, generally 3 or 4.

I move from 80>60>40>20 until I get data in the spectrum and waterfall. At that point, I can move back to 80m and see plenty of data now in both spectrum and waterfall.

It does not matter what band the radio is on before power down, the results are the same. No data in the spectrum or waterfall until I move about the bands. After a few band changes, signals come back. I can then return to the original band (as power on) and see activity.

The radio has through many upgrades from 3.x to current. It has never done this before. Only now with 4.2.20. No remote usage. This occurs using the radio directly. Windows 11 machine plugged into the same switch as the radio. Firmware and software match too.

Has anyone experienced the same or similar?