Curiosity: at this location (False Creek, Vancouver, B.C.)
my girlfriend's cell phone (Android Moto X; Android 6 Marshmallow) automatically powers down (off). When manually rebooting (turning on again), once powered up it automatically powers off, again.
If we move e.g. ~75-100 feet away, the phone operates normally?
This has happened on the two separate occasions that we tried to photograph some foliage, there.
What would cause this?
Update (Mar 10, 2019). My gf and I returned to this spot (~5 months later): her with new phone (Samsung Galaxy S7 Android 8 Oreo on a different wireless provider/account; GPS was ON). This time, no problem.
That said, the GeoFence idea mentioned in the comments was likely the most reasonable explanation for the past behavior; perhaps that fence is no longer active.