Seamaster crown now keeps falling off
Having recently had my Omega Seamaster serviced...7 weeks and 500 pounds later, now the helium valve keeps unscrewing itself. Normally I see this and rescrew down but now I has lost it altogether.
Was this something that was missed during service? It sent to Omega workshops for the service (or so I was told) and now has started this. Why is this happening and what happens now?
Any advice appreciated