Compare the timing of the two actions
Ask the other viewer whether they started a video at the time the first screen stopped. Opening an app, browsing a guide and actively playing a video are different actions. Build a simple timeline: television starts, phone begins video, television stops. That sequence is much more informative than a general report that the connection is unreliable.
Use a cooperative test during a low-stakes programme. Agree which screen should continue, then stop playback on the other screen and retry the intended session. Do not repeatedly start competing videos while someone is watching an important moment. The aim is to identify the trigger with the fewest interruptions.
Distinguish a device list from active sessions
A household may legitimately use different devices at different times. The fact that the service can be opened on a phone and television does not establish that both videos can run together. Treat a signed-in device as a possible receiving location, not automatically as an additional viewing allowance.
In a support note, record which devices were actually playing and the order in which they started. Do not post passwords, payment details or private account screenshots. A concise timeline lets support distinguish concurrent-session behaviour from a television that fails even when no other screen is playing.
Investigate other causes only when the pattern differs
If the television still stops while it is the only active video, keep that observation separate. Record the programme, time, visible message and whether the stoppage repeats on the same item. A one-stream explanation should not be stretched to cover every possible interruption simply because another device exists in the household.
For a shared evening, agree the active screen beforehand and stop the other playback cleanly. If viewers need independent simultaneous programmes, consult the current official product terms before changing or buying anything. This diagnostic process identifies a documented session limit; it does not assert that a particular account or television has been tested.
Questions about this guide
Does signing in on several devices mean each can play video at once?
No. The current help distinguishes multiple-device access from its one-video-stream allowance.