I've had pretty consistent problems with stuttering video. Strong signal wi-fi and 4g, multiple browsers and sites. Tried many different browsers and installing the last old flash for android.
Finally went and tried FlashFox as mentioned above and no more stuttering, all better... I haven't messed with it too much. I think the video player isn't very good in it in general, but at least I can watch things now. Unable to actually purchase full version for some reason at the moment though keeps giving me an error.