Forum:Deathclaw stalker?

I've been playing Fallout 3 on the PS3 and I have not updated the new patch so this may be just a glitch but for some strange reason a Deathclaw keeps following me around from a distance.When I enter a house sometimes I get ambushed by it and I died!The when I tried shooting it on other occasions, nothing happened. I mean when you shoot a death with a alien blaster 20 times there is something wrong! Eventually it disappeared though... Has this happened to anyone else?