Hello there, yes Apple have been fantastic. They realize it was their error and they sent me a new watch. I first booked a support call with them and exlained what was happening to the watch. They askEd if it’s been in water or damaged etc but this def was not the case for me. They then sent me a box to send it back to them, they tested it and said it was a software error, which the support guy had already suggested on the phone, and then they send me a new one. This took in total 6 days and they pay all postage x so your best bet is to log a support call with Apple and go from there.
I hope this helps x
regards
tara