Drop (formerly Mass Drop) makes some pretty nice looking, customizable, reasonably priced (for mechanical) keyboards.  Myself, I bought the CTRL, which is the "tenkeyless" style.  I got Kailh Box White switches.

There's just one really big problem: when you press a key, it sometimes registers two or more presses.  A lot.  Sometimes this is referred to as a "chatter problem."

There's a lot of discussion on this and how to remediate it and a lot of disappointed customers.  Some people look at it as a software problem -- there are suggestions to manipulate the debounce and wait times inside QMK (the embedded OS that these keyboards run).  I had limited success with this.  There are also suggestions to pop the switch out and "wipe off dust" or replace the switches entirely.  This didn't work for me and frankly it doesn't pass the sniff test.  Are really that many people getting dozens to hundreds of faulty switches or dusty connections?

So I tried a different approach.  Still thinking on the second suggestion that the problem might be the electrical connection between the switches and board,  I tried using DeoxIT Gold contact cleaner/lubricant.  This worked.  It completely solved the issue.  No more chatter!

I'm a huge fan of DeoxIT products.  It is expensive, but it absolutely works as advertised.  I've used this for years to help with scratchy faders or bad analog audio connections, it's no wonder it also works on mechanical keyboard switch connections.

So how do you use it?  It's easy, but tedious.  Buy the brush-on kind, pop out every single switch, and apply it to each metal connection pin.  Then stick it back in.  It is 100% fixed.  No double presses.

I used DeoxIT G100L (aka "Gold" or "Pro Gold") but the D100L solution probably works just as well, maybe better since it's designed for non-gold connectors.

After removing all the switches, ready to apply DeoxIT!

DeoxIT Gold:

Before application:

After application: