Could be flaky keyboard, flaky keyboard driver, flaky video card, of flaky user. Presuming it is not the last, I suggest trying the usual and typical computer solutions that often resolve periodic wonky issues.
- Delete the cache on each browser you use from the settings area.
- Run cleanmgr.exe from the system32 folder to clean up errant and unneeded temp files. On Win11 just start to type clean and it should pop up as Disk Cleanup.
- Reboot computer.
- Run windows update to install latest version. Also check under Advanced Options on the update page, then Additional options on the Advanced page, and install any updates noted there.
- If those don't fix the problem, open an elevated command prompt (Start > cmd > run as administrator) and enter
DISM.exe /Online /Cleanup-image /Restorehealth
DISM uses Windows Update to provide the files that are required to fix corruptions.
- when that is done run System File checker from that same cmd window with the command line
sfc /scannow
System File Checker scans Windows and restores your operating system files. It can take time. It won't delete any data files.
These steps should verify your system is operating correctly. If the problem is not resolved, try running the repair tool on your browsers from the Apps folder (if available), or uninstall and reinstall your browser with a reboot in between.
And if those don't work, your physical keyboard may be failing. They don't last forever and any gunk under the keys can produce sporadic typing. A good shake-out might be needed to dislodge crumbs et all that may have fallen "between the cracks'.
