Problem with Seiko 5 Superior

Hello all!

I've been a long time reader of this forum and thanks to information I picked up here I made a decision to buy Seiko 5 Superior with 7S36A movement.

That was 2 years ago. Everything was fine and I was enjoying my watch thinking it will work forever just like my father's Seiko 5 that he has since 80's and never needed any work done.

Unfortunately recently I started experiencing problem with my watch. It loses time, alot of time.
I tried to isolate the problem and this is what I came up with hoping some of you might be able to give me and idea where I should turn.

Since this watch has glass cover on the back I can tell when watch is running properly, when it stops and when it runs slow.
I would wind the watch like operating manual suggests and observe the following, if I hold the watch with dial up or to a side it works great, when I slowly turn it around and eventually position dial downwards I observe mechanism slowing down and eventually completely stopping when dial is facing down.
Overnight watch was sitting on night table on its side and didn't lose any time, then I started wearing it and in less than 3 hours it lost about 10 minutes, that's when I finally figured what I wrote earlier about watch stopping when dial faced down.

I did a bit of research and thought that watch picked up some magnetic field and needs to be demagnetized, I did the old CRT monitor degaussing trick, but it did not help.

I live in Calgary Alberta Canada and wondering what my next steps should be?
Can anyone suggest anything?

I absolutely love this watch and went out of my way to purchase it in Malaysia via watches88.com, which is reputable dealer according to my research.

I hope someone can help me out.

Thank you.