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Doesn’t apply here though does it? Assuming OPs internet is up to snuff overall and that it is only impacting some channels...
Yeah but their probably questionably legal TV provider will not be doing any troubleshooting to determine that and just use it as a get the ticket closed solution for a complaining customer.
There is a good chance it may solve it even if it just results in the playback coming from a different source with less congestion, or the VPN chosen has a better path out of the other country that it is in back to the customer than direct bandwidth from the data center that the stream source has. For a while, till the unpredictable nature of the internet changes performance and that path now sucks more and a different VPN provider is "better"