I got this message from Patreon
Hi there,
An issue with a payment partner is causing a slightly higher-than-normal number of your patron payments to be declined by their banks. We've traced the increased declines back to payments system upgrades required by one of our processing partners. Patrons might see some payments declined while changes take effect.
If a patron reaches out to you about a decline, you can advise them to follow these steps:
We’re deeply sorry about these interruptions and appreciate your patience as we work to resolve them.
The Patreon Team