I have the same problem with mine. There is actually an issue with the spring not being tight enough and it needs to be replaced with a new spring.
I have explained this to the repair person at my LQS and he (in broken English not too good) tells me that's not the problem I need to buy a new BSR Foot. Well, that ain't going to happen. I do not like this guy!!! I am going to speak to the owner of the shop again.
There was a whole thread on this issue. use the search feature and type in BSR Foot and you will see a lot of discussion on this matter.