In your logs why don’t you also log whether each device is connected to power and what preferences each user has set on a per app basis for push notifications, background data fetch, background downloads (distinct from background data fetch), as well as their do not disturb settings and timeframe, whether they are on a cell network or wifi, whether the wifi is exposing a networked backed by a cell network, the current battery level at each time, whether the device is changing location, whether the user is moving the device, whether the screen is locked, whether any app is in the foreground, whether any currently installed apps have code that gets invoked when geographic regions change, whether they have any code that is invoked when specific locations are visited, whether they have code that gets invoked when non-specific locations are arrived at or departed from, whether the user has recently changed networks, whether the user has recently plugged or unplugged the power, etc., etc., etc...

Don’t have all this data? Then maybe don’t jump to premature conclusions about what your network activity is telling you.