Buffering and audio sync issue

I have an android box using perfect player.
I've just done a speed test and am getting over 40mb. My box is connected by cable to my router.

I have now tried 2 different IPTV lines from 2 supplier but have had either buffering or audio sync issues with both. Are these just over subscribed suppliers, or is there something I can at my end?
 
It is called BT SPORT HD
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Thanks
Channel 38 in the sports channels is indeed HD thank you.
I was watching channel 39 which is labelled HD but is in SD.
Best trial I have had so far anyway
 
Is it common, on all IPTV lines that I would have to keep trying different versions of a channel to find one that is watchable?
 
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