Once you fix the issue, prevent it from recurring:

Over time, the application's cache can become corrupted, leading to persistent failures. Clearing the cache or data for specific apps—such as the Google Play Store—is a standard remedy for stuck download processes. Digital Rights Management (DRM) and Legal Safeguards

Internet Service Providers hate IPTV. Many ISPs actively block .m3u and .ts file downloads. This is called "Traffic Shaping."

This issue typically arises when the application fails to fetch the M3U playlist or configuration file required to stream content

This is the #1 cause. M3U URLs often have a shelf life. Many free IPTV providers change their links daily or weekly.

If the error persists while playing a stream (not a manual download):