loopback call failed messages print every hour - cant turn off

[MikeP]

About a month ago my iTelex started sending messages to my teleprinter (Teletype model 32) about every hour, printing the following message "INTERNAL MESSAGE, (DATE AND TIME), LOOPBACK CALL FAILED CONSTANTLY. CHECK ROUTER CONFIGURATION. LOOPBACK TEST WAS SWITCHED OFF".
I had to power off my teletype to stop these messages. I can send and receive, and I can also send test messages to print from the iTelex program on my PC. On the Network settings page, I DO have the "Loopback test period (0 to switch off)" set to 0, but it does not matter. This prints almost every hour, even when the internet is unplugged from the iTelex boards so this is some internal thing going in within the local iTelex boards.
Has anyone else seen this, and are there any suggestions on how to fix this? I can send screenshots of the iTelex settings if anyone is interested.

Thanks

Mike from New Jersey