Niantic Acknowledges Random Vibration Bug. Working on a Fix
Niantic used their social accounts to announce that they are working on a fix on the new bug called as “Phantom Vibrations”
In case you haven’t noticed after the last update you phone will randomly start vibrating, without any Pokemon popping up.
Here’s the announcement:
We are aware of and actively working on a fix for a bug that causes incorrect vibration notifications related to the Nearby Pokémon feature.
— Pokémon GO (@PokemonGoApp) December 10, 2016