Lets try to break this down into manageable pieces.
First can you provide your PMS version? The actual version number please.
A screenshot of your DVR settings page?
Record all not working
You’ve tried to set the “Show” 2020 Tokyo Olympics to record all events? But it wasn’t working? What wasn’t working? Did you receive an error message? Did the record request not get updated in the Guide? Did it update in the DVR Schedule pivot? When this happens can you capture and share your server logs?
Files playing incorrect videos
Can you provide some more details? Can you share the XML of an episode? Screenshot of the episode’s pre-play page?
Restart DVR service
Are you able to delete the DVR, shutdown the server, then add the DVR? If everything is the same, in my experience your previous recordings will be retained.
Feel free to DM me any of these files and pictures.