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Hi @bibin131
It might not be the walls, but there might be other signal interference that's causing it.
You may try to improve your home WiFi network with the help of our articles.
If you still have the modems that you were using before, then you may use it as an access point that will help lessen the signal interference via WiFI connection.
We'll be waiting for your account details via PM if you still experiencing issues.
BasilDV