Do notice that a base that is worthy of the new Purge needs to be out in the open, no gates, no doors and the Coffer basically on your front porch for the apparently disabled stygians to be able to make it there.
Granted, the new Purge is better than the old one when it does trigger, but a lot of people - me included - are facing the same issues of the Purge not spawning or not being able to find a path to the Coffer and calling it quits all of a sudden.