Try manually deleting the temp files. Click on Preferences > General > Manually Delete to remove the temp files and make sure all the files in use for the current project are deleted. Close PD, reopen it and see if the problem persists.
If it does, maybe make a screen recording so we can see the timeline and hear what's happening. Use the Attachments button below the forum text box if the recording is smaller than 100MB in size, otherwise upload it to YouTube or Googe Drive/OneDrive and paste a link to the clip.