Same here. There is obviously a problem with the infrastructure sitting behind TNT that can't cope with the demand which BT sport never had a problem with but I doubt we will ever get a public acknowledgement of that.
I raised this myself and was just told it was my device or broadband but my very simple point is that on the same device on the same Internet there is significant buffering on TNT/Discovery but its perfect on the bt sport app (I am using a Apple TV box with both apps installed from the marketplace)
