Mac ( Cherry) keyboard buttons not working

[2097]

Seem to have a random issue with some aftermarket Cherry mac keyboards we have

 

We have around 25 of them . Randomly keys stop working on the keyboards like the "G" key and the number "6"

 

Macs are locked down with centrify so need to workout whats causing it , at first i thought it was a dodgy keyboard lot as they are now "Discontinued" but i just tried one in my windows pc and it works , also another mac and the key that was faulty is now ok .

 

The issue is still present after a reboot , and also when at login screen ! so kinda rules out any keyboard bindings you can do in accessibility if the kids are logged on.

 

Any one else had this problem ?