I am living in a thick-walled house. My modems wi-fi couldn't reach to most of the rooms. I bought a TP-LINK TL-WA854RE to solve this issue. However, the wi-fi is so weak.

Then I borrowed my friends extender TP-LINK RE200. The signal become a little bit powerful but not enough.

Then I bought TP-Link TL-WPA4226KIT. I could succesfully connected to the wi-fi. But it was closing the wi-fi's of the devices 5 minutes later. It was a shocking error which I couldn't believe.

Eventually I need better signal with affordable price. Please advice me a good model for thick walls.