If you're seeing apps restarting, then it's likely that they are services or have service components that cause/do this inherent behavior, so force stopping them is really just wasting time and device resources.
If you have an app that you don't want to run, then you'll need to find (if it has this) the settings that control it's sync or background behavior (or remove/uninstall the app in favor of one that behaves in the way you desire--but oftentimes, the nature of the app dictates that it indeed has a background/service component).
Edit: also, your questions might (likely) will lead to references about this thread:
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