Question both shift keys stopped working

[hudtwalcker]

i've had this issue b4 and researched a lot about it and it eventually resolved itself but can't figure out how. now it's back, both shift keys stopped working, if i press them a lot they start working for a while then stop, i've already tried many things, it's not drivers, not sticky keys, any clue {insert question mark}

i have windows 10 pro 21h1

 

[Colif]

even in safe mode?

1. go to settings/update & security/recovery
2. under advanced startup, click restart now button
3. this restarts PC in a blue menu
4. choose troubleshoot
5. choose advanced
6. choose startup options
7. click the restart button
8. choose a safe mode (it doesn't matter which) by using number associated with it.
9. Pc will restart and load safe mode

if they work in safe mode,

Try a clean boot and see if it changes anything - make sure to read instructions and make sure NOT to disable any microsoft services or windows won't load right - https://support.microsoft.com/en-au/help/929135/how-to-perform-a-clean-boot-in-windows

it doesn't delete anything, just stops programs loading with windows. Easy to reverse.

if clean boot fixes it, it shows its likely a startup program. You should, over a number of startups. restart the programs you stopped to isolate the one that is to blame.