Mechanical keyboard double and triple typing

Hey all, I bought a Cooler Master Masterkeys pro L from @JDM_WAAAT about 6 months ago and recently it’s been having issues with double and triple typing letters. (It worked perfectly up until recently) I’ve tried turning down the repeat rate in Windows, tried it on another pc, and removed all the keycaps and gave it a thorough cleaning. Still having the same issues.

I’m wondering if anyone’s had similar issues with Cherry MX browns or this keyboard.

Also, has anyone RMA’d Cooler Master peripherals bought third party with any luck before? Thanks