sprint key/toggle not working reliably

I'm using sprint key as toggle ans sometimes I have to spam the key until I can actually start running.

Also I noticed that when alive, the score board shows some additional info for a split second when spamming the tab key (like K:A:D), this one was areadly reported,

Also having the issue with sprinting. I have to hit the key about 8 times before anything happens.

I found out that when the sprint toggle key doesn't work, if I toggle crouch (down then up) then I toggle sprint, it works right away.

But when I stop sprinting, it goes back to previous behaviour (unreliable sprint toggle).
I can repeat the trick to be able to sprint again.

last edited by Choucram

Same thing happens when trying to use focus after sprinting.