Hi sir, for what i've knew, error in gaming comes from a lot of factors. It could be the game itself has a problem, what i always do when i encpunter the same problen is that i check the game on the playstore if theres a new update on it, if its already updated then try to check its recent reviews regarding to that new updates. On the other hand, there's an instances that the game itself requires a higher specs than the usual. u may go to ur storage and determine whether your phone has a lot more of storage and capable of operating more heavier apps.
you may also want to consider the numbers of app installed to your phone and the files you've stored. imagine you have this X amount or processing power and RAM versus the apps you have will be fighting over those power. that may cause those crashes. I also have a friend who uses A30s but he don't have any problem he is also plays MOBA BTW rank as mythic.
Well, for some cases Samsung are not really design for gaming. Besides, mlbb is expanding its horizon. It keeps on updating every once in a while. Maybe your phone's memory is occupied with its memory usage that's why you are experiencing error whenever you play mlbb.
Maybe it's time for you to seek expert about troubleshooting your phone or report error to the Samsung service. 😊