1- Use a personal portal to Trevails waypoint.
2- Stay for an extended period in Trevail (I spent ~5 minutes).
3- Use the waypoint in Trevail to return to ‘Your Portal’.
4- ‘Your Portal’ takes you to the entrance of the location you were originally in, not the exact spot of the portal location.
after 10 minutes out of an area it resets the instance.