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I have the feeling these WiFi boosters are sensitive and error-prone. Is there no way you can put a cable through the house?

I could but tbh one of these should more than suffice. If not I'll just add a super duper router and replace the one I have, I was just trying to do it easily in all fairness.
 
with the repeaters, if they get bad signal, all they can repeat is the bad signal
plus, you loose a lot of bandwidth, since the repeater is having to talk to your main router, and your device at the same time.

Take a look at powerline networking, it will put the connection from your main router to the repeater on your house power wires, leaving the repeater full access to it's wi-fi hardware for sending the new network.
You can even get all in one powerline boxes with wifi built in.
 
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