Unfortunately, that is not the cause of the above. Yes, Android is good at garage collecting, etc.
But, with my Nexus 6p, I can't remember the last time I saw an app I needed, that was in the background, refresh. I can scroll 8 or 9 apps back (never have had a need to go further), pull up a chrome webpage or tapatalk forum, and not see a refresh. In terms of multitasking, it seems the 6p is the reigning champ.
The Galaxy S7, while better than the Galaxy s6, is more aggressive than the Nexus 6p, or even HTC 10 in killing background apps.
The above is way worse, to the point where it refreshes ever single app. I find it very, very surprising that no reviewer caught this. It obviously seems some type of bug present in the Oxygen OS software. I would bet a forthcoming update would fix it.