Most people pay for IPTV monthly but don't use it daily. Resellers know this. Some exploit it.
A bad reseller will oversell their servers. They assume not everyone watches at once. Like a gym assumes not everyone works out at 6 PM. But during big events, everyone watches. Servers crash.
A good British iptv reseller doesn't gamble like this. They provision servers for peak demand, not average demand.
The British iptv service I use told me: "We assume 80% of customers will watch during the Champions League final. We build for that."
A lazy IPTV reseller UK assumes 20% watch at any time. That's fine for Tuesday afternoon. It's a disaster for Saturday at 3 PM.
Ask about their concurrency assumptions. "What percentage of your customers do you expect to watch simultaneously during peak?" If they don't understand the question, run.
Don't let your reseller treat your viewing like a gamble.