Internet Sharing suddenly stops assigning IP ...

I have been using Internet Sharing on my Macbook Pro OSX Lion since last couple of days. I have noticed that my iPhone  / iPad suddenly gets disconnected from the wifi and when i check the wifi settings of iphone and ipad, it shows that the IP are suddenly stopped assigning ... When i stop the the Internet Sharing and Start it again .. everything starts working ....
Can anyone help me fix this issue ?
Thanks in Advance ...
Regards,
Zuzar L.

zzzz same issue differnet post
https://discussions.apple.com/message/6390876#6390876

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