This is indeed strange, as the error basically pops up immediately. Never seen this before.
I know of no reports that updating Klipper might be causing this.
Generally, see Timer too close
- Your graphs would not indicate something amiss, although the frequency graph looks a bit strange indeed
- I’d try to simplify the system as much as possible and see if the error continues
- Remove additional USB hardware
- Remove non printing essential stuff like neo pixel
- Remove displays
- etc