From my experience it seems to be an issue with google chrome and seagulls tv. The only workaround i have found is running seagulls tv on enternet explorer, I guess you could also try running it on safari or mozilla firefox. If that doesnt work for you then try seagulls tv on your phone, that...
I had the same issue. I can watch seagulls tv on my phone but it wouldn't work on my laptop. Any chance you are using Google chrome? The only way I can make it work on a computer now is if I use internet explorer instead of Google chrome.
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Take a look at following link - https://www.reddit.com/r/soccerstreams/comments/7ff7gf/1500_gmt_manchester_united_vs_brighton_hove_albion/
There are always plenty of links to streams on this page, not all work though.