Telus WiFi Hub connect to a TPlink Ethernet Switch not stable

That's very odd. It's entirely possible it's an issue with the switch itself. I've had one gigabit switch (different brand) go bad on me in the past and it was unstable. I've got 6 different gigabit switches in my LAN, including the 2 of the plastic versions of the TP-Link switch you have (TL-SG1005D and TL-SG1008D), and have no issues currently. The older Optik TV boxes haven't interfered with the switches I have.