Sorry to hear about the issues you're experiencing, before reaching out via chat have you taken a look at this FAQ:https://fizz.ca/en/faq/my-wi-fi-network-cutting-how-do-i-fix-it
Try to disable "Airtime fairness" and "Band Steering" this should do the trick:
Here's how to disable Wi-Fi band steering via the Fizz Wi-Fi app:
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