Haven't heard of it so far. What modem do you have? If the iPad has been asleep long enough, it will typically shut off wireless to save battery and reconnect on wake. Are any other wireless devices you have experiencing the same issue as the iPad?
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I think the modem is Actiontec modelT1200h. Yes my iPad goes to sleep but I used to just be able to go back in when I woke it up by putting in my ID. Now I have to power it totally off and start fresh. It never happened till we got this new modem when we changed to telus TV. Always had Telus Internet though.