Yes, it is haphazard
Sometimes, the Ctrl functions work, sometimes they don't

But I found out that some Ctrl functions still work like

Ctrl+END : goes to the end of the document.
Same for Ctrl+Home. Still work

Ctrl+Arrow : highlights text in that direction. Still works.

So, it seems like only a group of Ctrl functions have the problem. Others are fine.

So far, these functions are affected:

Ctrl + A = Select All
Ctrl + S = Save
Ctrl + P = Print
Ctrl + Z = Undo
Ctrl + [ = Reduce font size
Ctrl + ] = Increase font size

Others seem to be OK.