Keyboard input yields double letters - how to fix?

[mosquito]

When I’m typing, independent of the opened program, sometimes a single keystroke results in the respective character appearing twice, i.e. typing example yields exaample. This behavior occurs randomly without any recognizable pattern.

I already tried varying the delay and repeat rate in the system settings, which did not change anything.

I’m using KDE Plasma 5.22.4 and kernel version 5.10.23-1.

As I’m quite new to Linux systems, I don’t really know how to locate or solve this problem and would appreciate any suggestions.

[freggel.doe]

@mosquito

This behavior occurs randomly without any recognizable pattern.

Are the some keys more affected than others?
Can you see the same behaviour when booted from a live iso?

[mosquito]

@freggel.doe

Are the some keys more affected than others?

No, all are equally affected.

@freggel.doe

Can you see the same behaviour when booted from a live iso?

Yes, but it happens with a lower frequency.