Magic Forums

I've just moved into my third shared flat, so I haven't gotten around to cleansing and warding it yet. I will soon, though. I've been in here for less than 24 hours and already I've had knocking on my door, always two knocks, three times since I woke up this morning and twice the evening before.
This double-knock occurred in both flats I previously lived in before I cleansed and warded my bedroom. It sounds exactly the same in each place and whenever I answer the door nobody is there, the hallway is empty. It did it in my family home, too, though it would often be more violent and on the front door or the walls.
Once I've cleansed and warded, it's fine. But the fact this spirit seems to be following me, despite my cleansing and protection, disturbs me. When I visit friends' houses and stay there for a few days, I've also experienced knocking.
I'd like whatever this entity is to stop following me. I know they can be stopped because they go away once I banish them from my new space, but they always come back once I've moved on. Any advice?