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Published 09:42 10 Aug 2015 BST
Updated 09:49 10 Aug 2015 BST

That means you have to go to the router and give it a bash (reset it) or else you must turn the Wi-Fi off manually on your phone, not a mammoth task but annoying all the same.
Now Apple have created handy little feature on iOS9 which automatically switches from your Wi-Fi to your mobile data if your Wi-Fi connection is poor.
According to 9to5mac, a new cellular setting called Wi-Fi Assist allows the phone to automatically switch to a cellular data connection when you have a bad Wi-Fi connection.
Great news for those of you who don't have time to be waiting on slow Wi-Fi although there has been no official release date for iOS9 yet...
Hat-tip to 9to5mac.