Quick bit of advice please

[Matt]

I find this sort of behavior often hints at a foreign body - a bit of hair, a loose screw or something like that. Whipping the back off and having a good peer and then tapping the inverted and open watch over a sheet of white paper can often lead to a discovery.

[Der Amf]

The de luxe has a design fault- the way into the back is text close to damaging a delicate part of the movement.

Its now been running nonstop for 186 hours, and I'm not doing anything to meddle with it

[is that my watch]

well the balance wheel is at the edge so you have to be careful when opening and closing but if it is working now I say leave as is