Well that kind of the ideal when you test out a beta software find and report the bugs you find seeing as it's not a fully realised software you WILL find bugs its kind off the ideal
Download good guardians from the galaxy store and use the galaxy app booster, it will help your phone and apps run better after each update you could also try clearing the cache partion as well
Ok obviously and Well to be fair it is only the stable release which doesn't mean there will be no bugs as with any software installations there may be bugs and issues that will be fixed if reported with future updates
Good shout, any other apps from the store you'd recommend? ...tried that Guardians +app booster for my Star Chart app, but no luck; its the only app I'm having trouble with since the A12 download, and Star Chart still works fine on my tablet running A11, which is less than ideal to hold and work with.
Try wiping the cache partition on the phone and that should resolve the issue. To do this, just search 'how to wipe cache partition S21' and you should find what you are looking for 🙂. Hope this helps! 😎