Could be a few things including your actual internet connection...
It's definitely not that - i usually watch stuff live on the tablet, upon which i experience no problems, beyond the fact that it is small.
but if you haven't already done so, try Google Chrome (which I've installed for you) as some systems stream better through that than Internet Explorer.
I always use Chrome (which i already had installed) - apart from that very small amount of time that BT Sport could only be viewed using Silverlight, which couldn't be added as an extension for Chrome so could only be viewed via IE. Outside of this nightmarish interlude, i always found that live-streaming was 'better' via Chrome than IE, but 'better' was relative - it was still pretty bad.
Actually, this evening i watched the Man Utd v. Liverpool game (via Chrome) and it was watchable - it wasn't absolutely stall-free but was much better than it has been before. TBF i'm not that bothered as i have the tablet as a back-up. Plus, of course, i don't actually
need to watch football (or cycling), it's just a pleasurable addition to the riches that life affords.
You've also got a third browser - the new Microsoft Edge which is included with Windows 10. Have a play as one may handle things better than another.
Funny you should say that, because i tried
Edge before the match started to see if it would be any better, but it didn't appear to be from what were admittedly very brief observations. The audio is fine but the pictures stalled a little too often in the time i gave it. May well give it another go at a later date to see how it performs.