Have you tried going to settings => device maintenance => and manage your cache, put your apps that are not in use to sleep, etc. Also I do not allow most of my apps to run in the background Any app you are not using => uninstall! No need to have apps installed wasting your battery and data if you do not use them. Go to Settings => Apps and review each App settings. Disable or uninstall, manage permissions, etc. Etc. See if that helps...
The tech guys at samsung 837 will most definitley be able to help you out
Go to 837, they can fix it
Just take it in, they help really fast.
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