You say a weaker wall, but honestly, how many walls actually fail from the joint size? Seems like one of those things that gets argued to death.

Been there with a smart plug doing the same thing. First thing you gotta do is check the device's own wifi settings. A lot of times they broadcast their own setup network that nearby phones can see. Make sure it's actually connected to your home wifi and not just sitting in pairing mode. If it is connected, go into your router and rename your network's SSID to something totally unique from your neighbors. That usually stops the cross-talk.

Honestly that rule sounds a bit over the top. A seam in a doorway is just another transition, right? If you prep the floor right and cut it clean, it should be fine. Your dad's advice might be from a time with worse materials. Good on you for trying it and proving it works.

That $80 sting is a real gut punch, sorry you got burned.

My local coffee shop tried that last year and went back to dairy after two weeks. The owner said the oat milk just wouldn't hold any foam, no matter what brand or temperature they used.