Tv picture flickering in and off with sound on

[Sdoodle1]

Hoping to find an answer as to why my tv screen is flickering on and off while the sound remains on. Tried everything. Tested the tv in another location and no problem. Brought another tv in and tried on the flickering location and it had the same problem. Tired different HDMI cable, unplugging the modem and plugging directly into a dvd player..problem persists. Turned off wifi printer and fridge. What is causing this issue in this particular location? Could a neighbouring hot tub be the cause? Don’t know what has changed and at my wits end.

[57]

Many items can interfere with WiFi.  Do a web search for WiFi interference. The most common devices are things like Microwave Ovens, hair driers, large motors, etc.  You will need to track down the source of the issue by turning things off/on and watching for the issue on the TV.

This can probably be avoided by having an Ethernet cable between the Gateway and the Rogers box if that's possible for this location.