Check and see if the problem is on all wifi connections or just one.
BTW, I took my iPad to apple store and they exchanged it. Mini# 2 worked for a few days then had the same issue. I had my router replaced by Verizon but the issue persisted. Took it to apple store and it would only connect to one of their two hotspots. Now on mini# 3. Working for over a month now.
Very disappointed that Apple has a bug but does not have the decency to acknowledge the problem.