It isn't the kind of experience we want you to come across, Annargo.
As of now, the investigation into this error is still ongoing. Once we received an update from our Engineers, either my colleague or I will post it here.
In the meantime, you can check these references to give you more details regarding sending a reminder to your customers and how you can have them pay their invoices online:
I'm just a few clicks away if you have other questions or if you need anything.
