Please perform the following steps to resolve the issue:
1- Make sure that 20% internal storage is free for which clear the RAM memory and storage of device (Settings > Device care > Memory/Storage > Clean Now).
2- Settings > apps > select the desire app > storage > clear cache > go back > force stop.
3- Stop the background running app (Tap on the left soft key and close all the running apps).
For further assistance, register your concern in Samsung members app (Open Samsung members app > click on “+“icon > send feedback > Error report/Ask Questions).
Also we really appreciate your feedback regarding slow-motion feature. We would take this feedback for further improvements in our upcoming launches.
Happy to help you always!
Team Samsung Members