ipad pro magic keyboard only works when connected with charger

Hi

I have a 3 weeks old magic keyboard for my ipad pro 12.9 (last december)

When it is not connected to a charger the keys 2 W S X stop working.

Some times the first stroke works, maybe for some seconds it just skips some typing and the very quickly none of them work.- Then when I reconnect the charger the keys do work again.

I disconnect the charger and it stops working

I also tried restarting the iPad, installed latest updates and set the keyboard to specific keyboard layout.

Is it damaged?