@CyberMkII 

If your powerline kit is a TL-WPA7510, configure the wireless network for the wireless powerline adapter to have a different network name from your Orbi. What may be happening is your switch is jumping between the Orbi and the powerline if both network names are the same.

If your switch is connected via Ethernet cable and your powerline adapters are wired only, look at the powerline LED light (house icon). If that is red, try another outlet, you want the LED light to stay green. If the LED does stay green, try connecting a computer to the powerline adapter and see if the computer drops connection from time to time.