Nothing kills a match night like a stream that stutters every ten seconds, and I have learned that most freezes come from the home network rather than the provider. Start with a wired test: plug the box or stick into ethernet, run https://www.speedtest.net/ and compare the result against what your plan promises. If the number collapses at peak hours, congestion or throttling is likely, and background reading on how streams are delivered at https://en.wikipedia.org/wiki/Streaming_television explains why prime time hits hardest.
Next, clear the app cache and drop one quality step, from 4K to HD, to see whether the picture stabilizes. I keep a cheap ethernet adapter in the drawer for exactly this test, since hotel-style WiFi hides real speeds. A VPN trial on a nearby server can also reveal ISP shaping. When the basics do not settle it, the iptv troubleshooting guide fix buffering and common issues walks through each fault in order, from router restarts to playlist refreshes, so you fix the right thing instead of guessing. Work the list top to bottom and note which step changed the picture; that note saves hours the next time the screen freezes.