its either your provider or a player setting ? adds with sport must be v3 so unlightly its built in player but here are some screens to check in the settings:-
stream format have your clients to test all three it could be this thats messing up.
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or failing that try this :-
I normaly use hardware decoder as i use nvidia shield but no harm in testing between hardware and software
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finally if the two above dont work try this :-
you will be presented with two options ,test both also if you add an external player like MX or VLC they will appear as choices also on this screen .
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