A byte-range request asks for a portion of a resource. Seeking can depend on range support, media indexing and the delivery format. A video playing from the beginning does not prove that every seek position is available or supported.
Distinguish live and replay controls
A live channel without a replay window is not the same as an on-demand file. A seek bar may be unavailable by design. Check the service's actual replay offering before diagnosing a network fault.
Notice the response to seeking
If playback restarts, stalls or shows a different error only after a seek, report that sequence. It points toward the media resource or player interaction more clearly than a general buffering complaint.
Use supported controls
Avoid editing range headers or media URLs manually. The operator may need to inspect server responses and file structure. Trying another supported player can help compare compatibility, but it also changes the implementation.
