Suddenly jerky mouse movement

[ReinBijlsma]

Suddenly I'm experiencng jerky mouse movement and mouse lagging when working in Premiere Pro 2021. The program becomes almoest unusable. When I quit PP my mouse behaves normal again. Did a system  hardware check and no errors found
I didn't change any settings, no other programs running, latests Nvidia drivers installed, 
Win 10 Pro 64 b, P9900K, 1080Ti, 32 gb mem and running on 4K monitor. 

[Peru Bob · Accepted solution]

Delete the Media Cache and Media Cache files:
https://community.adobe.com/t5/premiere-pro/faq-how-to-clear-your-media-cache-in-30-seconds-in-premi...

If that doesn't work,try resetting the preferences:
https://community.adobe.com/t5/premiere-pro/faq-how-to-reset-trash-preferences-in-premiere-pro/td-p/...

If that doesn't work, try resetting the Workspaces:
Reset a workspace
Reset the current workspace to return to its original, saved layout of panels.
1. Do one of the following:
• Click the Workspace menu icon and select Reset to Saved Layout.
• Choose Window > Workspace > Reset to Saved Layout.
from here:
https://helpx.adobe.com/premiere-pro/using/workspaces.html

If that doesn't work, try Preferences > Audio Hardware and set Input to None.

If that doesn’t work, try updating or rolling back your graphics driver directly from the video card manufacturer’s site.

If that doesn't work, try creating a new project and import the old one into it.