Guys i completely can back the fact that the miyota zf is using is unreliable
i had a zf aquanaut, after some days of having it the second hand wouldnt want to move, it was fully charged but it just wouldnt move so i had to wind the crown and it worked but i noticed that it always stopped at the same spot
after sometime even winding the crown it wouldnt want to move from the same spot, so i started hitting the watch with my fingers and it moved, however it did one complete circle and stopped at the same place anyway
bored of it i hitted it repeatedly till it started working again
i then wore it for 10 days straight without an issue and when i took it off and it naturally lost its charge it would always stop at the same spot
hitting it as before achieved nothing but another full circle and coming back to its spot
Also what i can say is that the movement is dirty as hell, mine had a stain on the decoration which i didnt notice during the qc, it was black and sticky like a dirty chewing gum
now my aquanaut is being serviced and i also got a zf calatrava which doesnt hold much charge, when i take it off in the evening it stops after a couple of hours even as i fully wind it in the morning
i read of at least one other miyota having the same trouble in this section
imho these 9015 are a timebomb and i advice you to get yours serviced asap, my calatrava is going as well when the aquanaut returns