Subject: Re: Medicare part D billing strangeness, anyone?
No. Received my monthly e-mail notice on 2 Jan (like I do every month) from UHC:

We’re processing your payment.
We received your premium payment of $xxx.xx (which includes a 31.3% increase from 2025 - No, they didn't mention that part... but that's what the increase calculates to!).

It may take up to 10 days to process your payment. If your payment is unsuccessful, we will send you an email.

In 14 years its never been "unsuccessful". I would check credit history, etc. Sounds like something that happens from ID theft, or maybe a bank/payment change? Call'em.