I have an SKX 7s26 parts watch with a movement problem.

Specifically, the movement seems to run approximately 20 minutes fast every 24hrs when the watch is worn in the normal wrist position or stored flat with the dial facing upright.

Alternately, the movement appears to keep near-perfect time when the watch is stored flat with the dial facing downward.

Any suggestions as to the possible cause and possible fix from 7s26 forum gurus would be greatly appreciated.

Thanks in advance for any and all replies.