I have a BT Smart Hub 1 and a Synology DS118 NAS drive. Both work with no issues. I've just added a TP-Link AV600 (TL-PA4010P) powerline starter pack to extend my wired network. The powerline uses a different port on the back of my Smarthub to my NAS but the moment I switch the powerlines on, I lose access to my NAS drive. My SmartHub homescreen shows it is there, when I punch the ip address in I get the "Hello! Welcome to Synology Webstation" but when I add :5000 on the end of the ip address, nothing.
Turn off the powerlines, reboot the NAS drive and all is good again. Switch on the powerlines, bye-bye NAS!