Here's what a short summary of your flight data looks like:
DJI Flight Log Viewer - PhantomHelp.com
The recorded data only lasts for 4:05.7 and it appears that you were in full control until the data ends.
You were losing signal with a few lost downlink messages after 3:29 and the downlink was lost for 32 seconds on one occasion.
Signal was lost completely a few seconds later.
Losing signal isn't uncommon, but it usually results in the drone initiating RTH and coming home.
Possible explanations for a drone failing to return include:
Obstacles on the RTH path, strong winds, or .....
Your drone settings include three options for Loss of Signal Options.
These are RTH, Hover and Land.
The default option is RTH and this never changes unless you change it yourself.
Looking deeper into your settings, I see that the Failsafe Action that was set is: Land
Your drone will have commenced autolanding soon after losing signal.
The place to look is at 46.09876 -87.06166, and possibly a little further west.
Unfortunately, that looks like its forested and might be difficult searching there.