New (Nov 2020) Mac Mini repeatedly disconnecting from Bluetooth keyboard

From the community forum this Bluetooth keyboard repeated disconnecting from Mac Mini has been a recognized problem since at least the 2018 models. Does anyone have a fix for it yet? Just got my new Mac Mini with the M1 chip as soon as it was released and it worked fine for a couple week until it got a system software update. Now when the Mac Mini goes to sleep, it loses its connection to the Bluetooth keyboard. Bluetooth settings call for allowing Bluetooth devices to wake up the computer and the keyboard has 100% charge in batteries. Keyboard is no more than 5" from computer. When waking from sleep, the Bluetooth keyboard is not connected and thus cannot enter the password and I have no way to access Bluetooth settings. My only solution has been to take a USB keyboard from another office and connect it, which allows password entry. Very frustrating. Eventually the Mini recognizes the keyboard and connects. Any ideas?