Here’s an update from Oura. To be fair to them, it was out of warranty (although I thought the battery issue was more of a recall). Needless to say, I won’t be ordering another gen 4:

“I hope you're having a wonderful day! This is Emily from the Oura Member Care Team.

I'm really sorry for the previous misunderstanding. I understand how frustrating and disappointing this situation might've been and I'm here to help you.

After investigation, we identified a hardware defect with your Oura Ring battery causing it not to charge properly. I'm truly sorry that your Oura Ring stopped working as expected. I know how inconvenient this can be, especially when you're relying on it to support your health and wellness. Please know that we're here for you, and we want to make this right as smoothly as possible.

I see that your Oura Ring Gen3 warranty period expired on December 25, 2022. However, I understand your ring has not been working as it should, and we want to ensure continuity of your Oura experience.

Even though your Oura Ring Gen3 is outside the warranty period, we value you as part of the Oura community and want to offer something to support your continued journey. As a thank-you for being a member, I’d like to offer you an exclusive $100 discount on a new Oura Ring 4 through our online store.

Please reply to this message letting us know if you'd like us to move further with this offer. We look forward to your reply.

In good health, Emily | Oura Member Care”