Unresponsive screen after update
I have a late 2015 27" iMac with fusion drive, currently Catalina 10.15.5. After almost every update, after restart there is a screen that is unresponsive to mouse clicks and keyboard return, no way to Continue. So I have to press and hold the power button and force a shutdown. Sometimes I have to do it twice. This happens both when the Siri screen is displayed (below), or the screen showing my name and avatar in the center with 3 options down below - sleep, restart, and continue. Sometimes using tab and the spacebar I have gotten to the password screen and was able to proceed. Been going on for about 2 years. Any remedy for this?
iMac 27″, macOS 10.15