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My Forerunner 35 won't sync

I can't get my forerunner 35 and my new iPhone 13 to talk to eachother. They did in the start, but no I can't get them to sync. They are connected by Bluetooth, but when I tell them to sync it works for a while (the phone and the clock is near by), but after approx 10 min, it tells me that the sync failed. Both the phone,the connect app and the clock is updated (the app reinstalled and the clock booted). What can I do to mace them sync?