Is you WiFi secured? Maybe your WiFi is busy because other people are getting free internet from you. When you connect to your modem with a laptop via WiFi, it should be labelled as 'Secure', otherwise anyone can connect. If it is not secure, get your ISP to fix it. Be aware that after it is made secure, you will have to re-connect all of your devices using a key or pass phrase. Hope this helps to reduce the possibilities for 'busy'.
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