Sunday night is peak IPTV time. Everyone watching the same shows. Servers get hammered. This is the real test.
I monitored three services every Sunday for a month. Same time. Same shows.
Service A (cheap international): Buffered 8-12 times per hour. Unwatchable.
Service B (mid-tier): Buffered 2-4 times per hour. Annoying but tolerable.
Service C (British iptv reseller ): Buffered 0-1 times per hour. Sometimes none at all.
The British iptv service told me their secret. "We add 50% more server capacity on Sundays. It costs more, but we charge enough to afford it."
A lazy IPTV reseller UK runs the same capacity every day. Sunday is a problem. They hope you don't notice.
Sunday night is when your service proves its worth. If it's breaking every Sunday, you're paying for frustration. Switch to someone who plans for peak demand.