New
#11
It's been four weeks since our last exchange on this issue and I'm pleased to report the problem has not re-occurred. I stopped the Develo Network Service - I might need it again later if I decide to add some more LAN-over-power devices so I didn't uninstall it. Although I can't prove a negative, I'm hoping that four weeks trouble-free use means that we've found the source of the problem. And that I haven't just jinxed it!
Thanks again for your help.
Andy