okay.. now, this is (very) interesting.
I factory reseted my Google WIFI Nest routers and have configured only one this time in Bridge mode.
It works fine... until I open Popcorn Time. When I do that, I have the same problem as before.
When I close the application, everything goes back to normal (where before I had to restart my PC for things get back to normal)
🤷♂️🤷♂️🤷♂️🤷♂️🤷♂️