Youtube app only works on iPhone 4S when Wi-Fi is turned OFF?

Can someone please explain this to me?
It's usually the other way around for everything else on my phone but with
this new Youtube app I can only watch videos using 3G.

I checked to make sure it isn't a problem with my internet and it isn't.

I really hope someone can help me with this because it uses up my data plan when I'd rather just use my Wi-Fi.

Might as well redownload the youtube app or turn off your phone and turn it back on or do a quick soft reset

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