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 NVIDIA, do a clean installation of the latest Studio Driver (NOT the Game Driver)
If that doesn't work, try creating a new project and import the old one into it.
how much RAM do you have and how much do you have reserved for adobe apps in Premiere preferences: memory. Are you running any other programs at the same time. Might try only running Premiere at least as a troubleshooting step... And do you have sufficient empty space on your startup drive and media drive. Should have at least 20% free space on your startup drive and 10% on all other drives.