P.9000 VSF clone problem

[rcom440]

P.9000 clone in my VSF pam389 Is starting to act up.
I noticed that when watch is positioned at certain angle balance wheel slows down or even stops. For example when crown guard side of the watch is down watch slowly stops. When it lays flat it works perfectly.
movement looks clean.
Do you guys know what could be the problem? Dirty movement, debris getting stuck in the gear or faulty power reserve, perhaps main spring?
cheers

 

[tommikeson]

I'm going to guess it is dry.

 

[rcom440]

I'm going to guess it is dry.

it’s probably dirt because when I wear it, it loses time. it seems that balance wheel slows down.
When it lays flat it’s perfect. I wore it 7 times and it worked fine until yesterday.
Its really easy to service p9000 clone as long as parts are not damaged so I’m wondering if anyone had similar problem with p9000 clone.