I recently switched to a new mechanical keyboard (a compact 65% layout with Cherry MX Browns) for my home office setup. At first, everything felt great, but after a couple of days, I started noticing random double letters appearing when I type fast - like "heelllo" or "committ". I’ve tried cleaning under the keys and updating my keyboard firmware, but the issue persists. I’m using it on a Windows 11 PC and have also tested it on my laptop, where the problem shows up too. I’m wondering if this could be a hardware debounce problem or maybe some software glitch in Windows keyboard drivers? Has anyone experienced similar random repeated key presses with mechanical keyboards? Also, are there any diagnostic tools or tricks I can try to isolate whether it’s definitely the keyboard hardware or something on the OS side?

On 03/01/2026 at 6:55 AM, TechWhiz123 said:

I recently switched to a new mechanical keyboard (a compact 65% layout with Cherry MX Browns) for my home office setup. At first, everything felt great, but after a couple of days, I started noticing random double letters appearing when I type fast - like "heelllo" or "committ". I’ve tried cleaning under the keys and updating my keyboard firmware, but the issue persists. I’m using it on a Windows 11 PC and have also tested it on my laptop, where the problem shows up too. I’m wondering if this could be a hardware debounce problem or maybe some software glitch in Windows keyboard drivers? Has anyone experienced similar random repeated key presses with mechanical keyboards? Also, are there any diagnostic tools or tricks I can try to isolate whether it’s definitely the keyboard hardware or something on the OS side?

That double letter issue sounds super frustrating, especially since it happens across different devices. Since you’ve already updated firmware and cleaned the keys, it might be worth trying a tool like Switch Hitter or KeyboardTest to see if any keys are registering multiple presses from a single tap. Those can help confirm if it’s a hardware debounce problem.

Also, some users have mentioned that certain Windows settings or keyboard repeat rates can cause similar symptoms, so tweaking the “Repeat delay” in your keyboard settings might be worth a shot. If the problem persists even with a different PC and OS, it’s probably the keyboard itself, but if it clears up on another OS, then it’s more likely software-related.

Cherry MX Browns usually don’t have debounce issues, but sometimes a batch can be a little off. If you’re still under warranty, maybe consider reaching out to the manufacturer for a replacement or repair

On 03/01/2026 at 6:55 AM, TechWhiz123 said:

I recently switched to a new mechanical keyboard (a compact 65% layout with Cherry MX Browns) for my home office setup. At first, everything felt great, but after a couple of days, I started noticing random double letters appearing when I type fast - like "heelllo" or "committ". I’ve tried cleaning under the keys and updating my keyboard firmware, but the issue persists. I’m using it on a Windows 11 PC and have also tested it on my laptop, where the problem shows up too. I’m wondering if this could be a hardware debounce problem or maybe some software glitch in Windows keyboard drivers? Has anyone experienced similar random repeated key presses with mechanical keyboards? Also, are there any diagnostic tools or tricks I can try to isolate whether it’s definitely the keyboard hardware or something on the OS side?

That double letter issue sounds frustrating, especially since it happens on multiple devices. Since you’ve already updated the firmware and cleaned the keyboard, it might be worth checking if the debounce time settings can be adjusted - some keyboards let you tweak that via their software or config files. If your keyboard supports QMK or VIA, you could try increasing debounce delay to see if it helps.

Also, just to rule out Windows quirks, you might try booting into a Linux live USB and testing the keyboard there. If the problem disappears, it could be a driver or OS-level issue. Otherwise, it’s probably hardware-related, like a slightly faulty switch or PCB contact. Cherry MX Browns are usually reliable, but sometimes a batch can have minor defects.

On 03/02/2026 at 8:50 PM, steady_pine said:

On 03/01/2026 at 6:55 AM, TechWhiz123 said:

I recently switched to a new mechanical keyboard (a compact 65% layout with Cherry MX Browns) for my home office setup. At first, everything felt great, but after a couple of days, I started noticing random double letters appearing when I type fast - like "heelllo" or "committ". I’ve tried cleaning under the keys and updating my keyboard firmware, but the issue persists. I’m using it on a Windows 11 PC and have also tested it on my laptop, where the problem shows up too. I’m wondering if this could be a hardware debounce problem or maybe some software glitch in Windows keyboard drivers? Has anyone experienced similar random repeated key presses with mechanical keyboards? Also, are there any diagnostic tools or tricks I can try to isolate whether it’s definitely the keyboard hardware or something on the OS side?

That double letter issue sounds super frustrating, especially since it happens across different devices. Since you’ve already updated firmware and cleaned the keys, it might be worth trying a tool like Switch Hitter or KeyboardTest to see if any keys are registering multiple presses from a single tap. Those can help confirm if it’s a hardware debounce problem.

Also, some users have mentioned that certain Windows settings or keyboard repeat rates can cause similar symptoms, so tweaking the “Repeat delay” in your keyboard settings might be worth a shot. If the problem persists even with a different PC and OS, it’s probably the keyboard itself, but if it clears up on another OS, then it’s more likely software-related.

Cherry MX Browns usually don’t have debounce issues, but sometimes a batch can be a little off. If you’re still under warranty, maybe consider reaching out to the manufacturer for a replacement or repair

Since you’ve confirmed the issue happens on both your desktop and laptop, it’s pretty telling that the keyboard hardware might be the culprit rather than Windows drivers. Cherry MX Browns are usually pretty reliable, but sometimes the debounce time set in the keyboard’s firmware can be too short, causing those double presses when typing quickly.

One trick I’ve used before is to try a tool like Switch Hitter or Keyboard Tester online to see if keys register multiple hits with a single press. If you see repeated signals there, it’s definitely hardware-related. Some custom keyboard firmwares (like QMK or VIA) let you adjust debounce settings - if your keyboard supports that, tweaking it might help. Otherwise, it might be worth checking if the seller offers a warranty or replacement.

Also, just throwing it out there: have you tried plugging it into a different USB port or using a different USB cable? Sometimes

On 03/01/2026 at 6:55 AM, TechWhiz123 said:

I recently switched to a new mechanical keyboard (a compact 65% layout with Cherry MX Browns) for my home office setup. At first, everything felt great, but after a couple of days, I started noticing random double letters appearing when I type fast - like "heelllo" or "committ". I’ve tried cleaning under the keys and updating my keyboard firmware, but the issue persists. I’m using it on a Windows 11 PC and have also tested it on my laptop, where the problem shows up too. I’m wondering if this could be a hardware debounce problem or maybe some software glitch in Windows keyboard drivers? Has anyone experienced similar random repeated key presses with mechanical keyboards? Also, are there any diagnostic tools or tricks I can try to isolate whether it’s definitely the keyboard hardware or something on the OS side?

@TechWhiz123, that random doubling sounds like classic debounce issues, especially since it happens on multiple devices. Cherry MX Browns are usually pretty reliable, but sometimes the keyboard’s firmware or the controller’s debounce timing can be off. Since you updated the firmware already, maybe try adjusting the debounce delay if your keyboard software allows it?

Also, have you tried testing it with a simple key tester website or a program like Aqua’s KeyTest to see if the double presses happen consistently on specific keys? That might help pinpoint if it’s hardware or something weird with Windows. Some folks have also had luck disabling “Filter Keys” in Windows accessibility settings to rule out OS-level input quirks.

Curious if anyone else with a 65% board has seen this after a few days of use. It’s weird how it starts smooth and then gets glitchy! Keep us posted on what you find.