You probably are living in a flat/appartment where there exists lots of wireless networks. Try running a Wi-Fi frequency scanner tool called Acrylic Wi-Fi Home (ask Google) on a laptop at home. Then check under the tab "AP channels in 2.4GHz" to see if other wireless access points are occupying the channel your router is using. You can manually select a less busy channel on your router. Or perhaps even consider moving over to the 5.0GHz frequency range where much less devices are using it. Just be aware that the range of 5.0 GHz is not as large as 2.4 GHz. Please also note that if you frequently have switched your TV network settings from LAN to WLAN or vice versa, you want to make sure that you not only disable the method you don't use (in your case physically disconnect the LAN cable from the TV) but also that everytime you fully complete the Easy Connect wizard to do the switch.