the problem my left-shift key does not work I press it on the left edge of the keycap, and it only works if press it in the center what could be the problem?

If you are using Nvidia's GPU use RTX Voice, it will basically remove every background noise. I hope this helps, Blue are noisy no doubt about it.

I am really enjoying it also the aluminium frame feels really great. I replaced my old office dell keyboard with this.

thanks btw if you broke a switch can you replace it?