Sometimes, 173 spawns in a room I'm currently in, and it almost always spawns behind me. Luckily, I have a video on Youtube that shows this happening (Watch from 3:47-4:15, 173 spawns exactly at 4:10 after I loaded the save and turned around):

http://www.youtube.com/watch?v=bFuDhlYc ... iQ&index=2

As you can see, 173 spawned earlier the first time. The second time, it spawned when I crossed the same point as the first time. This leads me to believe it's a problem with spawn trigger locations where 173 spawns when the player crosses a certain point.

I also have a compilation where the first two scenes show this happening in different rooms:

http://www.youtube.com/watch?v=HG1i5Sadpr4

Yeah, this has happened to me a lot, usually in the 4 way halls.

I don't know of any way to fix it or i'd help you out, when you come into the rooms you think he may spawn behind you, try walking backwards.

Also, welcome to the forums!.