It's not a bug it's Samsung! It's been one day since my watch active2, without even asking me whether I'm willing to reset it or not, just did it after an attempt to connect it again to my phone. Yes I did a hard reset on the phone so what. Since then what ever I did I couldn't connect to the phone again, reinstallation, hard reseting whatch, brought no positive result. Update. Can connect without any trouble to my Huawei but not to a S21U. Funny, isn't it?