My CHS Swiss ETA ordered on 19th June, arrived 26th June and sent back 28th June, still being repaired
The GMT, hour and minute hands would randomly stop but the seconds hand would continue sweeping round
Also, the alignment of the GMT hand would drift so that it was out by either 15 or 30 minutes, moving the crown to the third position and winding forward a couple of days woud re-align it but it would then just drift again
When it comes back I'll start looking for a movement swap alternative for it, no more GMT reps for me