Sorry to hear that. A little bit of an odd problem as well - running for quite some time before stopping, but not really long enough to reduce the torque from the mainspring by any tangible amount.

I had this same problem with my first Navi 01. The watch would stop anywhere from 45m - 3hours when the chrono was running....and this was on a full wind. If the chrono wasn't running, the watch would run perfectly fine and well within COSC specs, but once the chrono was engaged it was only a matter of time before the entire watch crapped out.

I sent it to Breitling for 3 weeks and they repaired the issue....so they thought. I got the watch back and sure enough after about an hour, with the chrono running, it stopped. And yes it was fully wound. Thankfully, this is how the watch arrived to me from my AD, so he swapped it out with a brand new one, but still this is not good reflection on Breitling's QC department or service department.

Thus my fear. I have decided I will send it, not the AD, so I can provide direct and accurate input as to the problem. And that I expect it to be tested with the chrono running for at least 24 hours. I left the chrono run from time to time, so this is new as of Monday. Ironically I have worn it every day for a week straight.


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I assume there isn't much risk wearing it for a while until I send it in.