let me add that connecting my Apple TV 4k directly in a gigabit port on the Telus T3200m has solved this freeze problem on the Optik TV app which is basicallly the same as the Pik TV app.
I had the same exact problem with the Optik TV app on my Apple TV 4k. At first, it was via a wi-fi link and then I moved to a Cat 5E wired link with the same result. Telus support told me it was because I was using another router and port bridging o...