After two days of trying everything to fix the problem to connect my acer iconia a 500 to wifi ,and talk with everybody at technical Acer support personal finally i found by myself how to fix it and it is very simple and the best it REALLY WORKS , and here it is : when your tablet it's trying to connect to wifi signal an fall into a loop pinch the reset button an reset the tablet , when the tablet restart , it connects direct to the wifi source and the problem is solve , buala !!!!!!!!!! very simple , and it is all .
Thank you so much. I can verify that this worked for me also!