It also seems isolated to your PC as nobody else has posted about this.
In order for anyone to help, we'd need lots more info, starting with the DxDiag test results as described in the Read Me Before Posting
guide.
Also tell us if you've get the most recent update (19.1.2321.0) as well as a description or screenshot of your project's timeline and the kind of edits you're making; whether you're using shadow files or not; and what PD's preview resolution is set to.