Direct answer
Unexpected input changes usually come from HDMI-CEC commands, a stuck remote key, automatic device detection or a newly waking source—not a broadcast signal problem.
What this covers
- The observed symptom matches this record
- Customer-accessible settings, connections and external components
- Diagnosis before reset, deletion or component replacement
What it does not cover
- ×A model-specific error code with a different documented meaning
- ×Internal electrical, battery-cell, gas, refrigeration or sealed-component repair
- ×A guarantee that every model exposes the same control label
Capture the exact symptom
ReversibleRemove remote batteries briefly and note which connected device wakes immediately before the switch.
Run the smallest isolation test
ReversibleDisconnect HDMI devices one at a time or disable CEC on the suspected source for a controlled test.
Correct only the proven cause
ReversibleReplace the stuck remote or change CEC/auto-input settings on the device proven to send the command.
Verify before changing anything else
ReversiblePower everything off, then wake each source separately and confirm the TV stays on the chosen input.
Evidence ledger
Sources behind this answer
Visible sources support the visible claims. Home Product Support records the publisher, the fact used and the review date; community reports can suggest an issue but do not become a published fact on their own.
Exact questions
Common follow-ups
What should I check before resetting anything?+
Remove remote batteries briefly and note which connected device wakes immediately before the switch.
What is the safest isolation test?+
Disconnect HDMI devices one at a time or disable CEC on the suspected source for a controlled test.
When should I stop troubleshooting?+
Service is appropriate if the TV changes inputs with all HDMI devices disconnected and no remote active.
Answer for the exact device and software version shown above.