"Repairing" your drive daily?
If you are OK with doing that, then continue on. But, why would you think that you would ever need to do that, particularly that often?
And, No, I am not suggesting that you install Catalina on some other drive. I am suggesting that reinstalling Catalina on your normal boot drive COULD take care of whatever problem that you might be experiencing, so you might not need that "repair" for some problem on your system that should not be happening.
And, one method that might be the most convenient for most users: Download the Catalina installer app. Create a bootable installer from that on a flash drive. Catalina needs to be on larger than 8GB, and 16GB is a great size for that.
DiskMakerX has a great utility for creating bootable installers.
What app are you using to run your slideshow? Maybe that is contributing to the problem, too (?)
One last question (I promise!) - If your 1TB drive is a hard drive (not an SSD), then the BEST move forward is to fix THAT by replacing the hard drive with an SSD. That will likely be the best step for you. (modern macOS systems are not optimized to effectively use hard drives. That multi-volume APFS structure that Catalina places on a drive makes that situation worse. (Just something for you to consider, but it WOULD fix your live repair issue - you would not need to do it... )