I have the s21 Ultra as well, and I too have bluetooth problems. First of all, Samsung's customer service is a joke. Probably the worst ever. For my problem to be fixed, I either have to take my phone to a repair center or ship it back to Samsung for them to repair. The nearest repair center is over an hour away from me. I don't have time to do that. But if I ship it back, I'll be without a phone for a week to 10 days. I can't possibly go that long without a phone. I've had the phone for 3 weeks. I don't know why they can't send me a new one and I send this one back. Anyway, I wish I could help you with your problem. My only advice is to not waste your time with contacting Samsung. And I also suggest you don't get another Samsung product. I have all Samsung products too. I have every watch, every pair of buds, and I always upgrade to the newest phone. I also have all Samsung appliances. You'd think they would want to take care of a customer like me. Oh well, lesson learned. I wish you luck!
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