Hmm, this is a confusing fault and I will admit I don't have an instant fix for you. We might need to experiment with different security settings, port forwarding etc. It might be worth contacting Epson so see what they suggest as I suspect they'll have specific instructions on how to deal with such faults.
Let us know what you find out.
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Thank you. Yes, connecting via cable works ok and I'm having to do for now to printer working. It's not why I bought a wifi enabled printer though and means cables and positioning the printer where I don't want it.
Sorry to hear this. My resolution was to re-configure the Superb 3 into Modem Only mode, and provide my own router for the Wifi signal. This works fine, but not a good advert for a so-called 'Superhub'!