Upgrade Mini 2012 from 10.15 -> 11 , worked and now slow boot + not recognizing KB or mouse. Any suggestions?

Father in law (FIL) has Mini 2012 that I bought for him long time ago

it was running the latest available OS for it (I think 10.15)

The program he uses (Jam Kazam) stopped working for that OS

What I did

- downloaded OpenCore Legacy Patcher , created OS 11 boot, followed instructions and updated.

- we tested everything, everything worked (including Jam Kazam)

- worked for some time (at least a week).

- 'I did not do anything with it' , 'I actually do not remember if I did anything with it'

Current state

- computer boots, at boot it sees keyboard and mouse (I can use KB to select options ,etc)

- computer boots slowly (1 minute plus)

- gets to the login screen however at that time I get no KB or mouse . Tested different keyboards and mice, same thing - recognized fine at boot and then nothing.

- once booted, as far as I can tell, it is not frozen (time increments, etc) just no usb devices

Any suggestions?