This sound like remote infrared signal that gets interrupted. What kind of TV are you using? We’ve seen this case happen due to IR interference from some plasma TVs. What happens is some settings on the TV like Energy Saving mode or Backlight settings when enabled they radiate at the same frequency as the remote IR frequency causing interference. To eliminate this you can either move the decoder away from the TV, disable some TV settings causing this issue as mentioned or place an IR filter on the front panel where the IR receiver is placed to filter IR noise. The same can work by using a camera film and place on the front panel to filter the IR noise. Let me know if this helps.
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