Backspace key and "/' key not working - bluetooth wireless keyboard
I'm wondering if anyone can help as I've not found the solution to my problem in other forums.
I have a wireless, bluetooth keyboard which I was using connected to my MacBook Air (2013). Suddenly, the backspace key and "/' keys became intermittent in their function and eventually stopped working altogether. I unpaired the keyboard and repaired after restarting the laptop and function was restored but after typing for about 3-4 mins the same thing happened again. Now when I reconnect the keyboard there is no restoration to the function of the keys.
I have recently tried linking it to my partner's MacBook and neither key work at all on his either. When I use the keyboard with keyboard viewer you can see their is no response to either of these keys. Additionally, a cheap keyboard I bought has no problem and I can use all the keys.
Is this just a case of they are broken and I need a new keyboard (actually it's not that old but don't have proof of purchase) or is there someway to repair this. The cheap keyboard is so slow to respond I would have to look at getting another Apple one.
Thanks in advance for any advice.