I have paper billing, but I have BILL notifications turned on to receive via email and push notification. I receive this email every month on the 15th.

Last month, I received the email on the 16th (which was odd, as every other month, it comes like clockwork on the 15th for as long as I can remember - I've had an account for 23+ years).
Last month the bill ready email was delayed a day. This month it's now 3 days over when it normally comes and I still have not received it.
I don't want to review my account for savings or make changes. I just want someone to look and see if the "bill ready" email was ever triggered on my account for this month and tell me why I may not have received it on the 15th like I have for years. And I want to make sure it's a one-off and I will receive it going forward.
Thanks.