I had the same problem with the 'b' key double input on single press. I started using a silicone transparent keyboard protection to prevent dust and small crumb

I had the same problem with the 'b' key double input on single press. I started using a silicone transparent keyboard protection to prevent dust and small crumbs coming in. So far it's great! I know this is very frustrating, so give it a try. It shouldn't cost more than 10-20$ and it's totally worth the price imho.