Why do online videos not play properly on my iphone 5?

Its always on Wi-Fi - my internet connection is very good I have fibre optic but videos play for a few seconds then stop and buffer and most of the time I just have to give up.
Please no stupid childish comments about andriod

Added (1). No not virgin I did a speed test and it says I get 25 MB but they play fine on my laptop and when I use 3g…

What is the speed of your broadband? They should play seamlessly if you do not have a problem with your speed. Very doubtful there's anything wrong with the phone, sounds like your network is throttling back your speed… Virgin by any chance?

It may happens for 3 reasons
1.Net Speed.
2. Flash Player problem.
3.Soft bugs

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