MacBook air loses default wi-fi connection

I am a new Mac owner, with a MacBook Air running OS X 10.7.2. For weeks after getting it, it would always connect automatically to my default home Wi-Fi network. Not any more, as every time I power up or wake from sleep I have to reselect my router on the Wi-Fi. This seems to have happened randomly. I have it as no 1 in my Wi-Fi preferred networks under advanced network settings. 'Remember networks' is ticked.
Does anyone know if I can stop this and make it connect automatically again? I have already done the suggestion of going into network preferences > wi-fi and deleting the network with minus button... it still asks me to reconnect to it every time it boots or wakes..

Hi there Nighthawk9864,
You may find the troubleshooting steps in the article below helpful.
Wi-Fi: How to troubleshoot Wi-Fi connectivity
http://support.apple.com/kb/HT4628
-Griff W. 

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