USPS priority shipping no longer an option for FBM? Or just a temporary problem?

I’ve been selling through Amazon as a Fullfilled-by-Merchant seller for several years. I think about 5-10% of customers pay seem to pay for expedited shipping. And It’s been no problem, I just take their extra money and use it to buy USPS Priority shipping instead of USPS Ground Advantage. I prefer USPS over UPS or FedEx due to their proximity to me. They’re also a bit cheaper and come with some simple insurance for ground advantage.

During the last few weeks, USPS has not been an option for my expedited orders. It’s been giving me estimated delivery dates of like a full week! So I end up using UPS Ground (like 50 cents more than USPS Ground) and get it there on time.

Is something happening with USPS Priority, like a major backlog right now? Or should I expect this to continue longterm?