TV Repair Questions? Ask a TV Technician for Answers ASAP
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There are many possible causes of this, including a bad aerial, loose connection, or internal hardware defect in the box itself (most likely).
Can you tell me the full make/model of the box?
Initially, can you please unplug power to the box, at the mains, for 60+ seconds. This should allow it to reboot, and hopefully clear up any temporary memory faults that could cause this.