I had set up a reoccurring invoice template in May for 12 payments, invoices were sent out automatically for May, June, July, August and September.

Then it stopped by itself without any user interaction. Can someone tell me what would cause this to happen?

The reoccurring invoice entry shows that the last one was sent out on September 15th but there is no "Next Date" listed.

Same thing happened to another reoccurring translation but it showed that the email address on file was NOT working for October's invoice and (in result) the subsequent invoices were NOT sent out!?!... but we are emailing each other using that very same email?!