Some buttons stopped working on Bluetooth Keyboard

So the other day i was using my keyboard playing LoL(the game) and when i joined another game it stopped responding and now my keys from a to l (the middle row) plus the key z has also stopped working...

I have tried deleting it from the bluetooth list and re-adding it but this doesnt solve the problem..

I have also tried resetting SMC and PRAM but still that doesnt help me neither...

Is there any way to get these keys back to a working state or ill have to get a new keyboard?

Thanks