I’m frustrated

Why is my Signal Limit Led on the TSSub12 Subwoofer coming on?

Friends Forum!

TS12 have two subwoofers.

After 40 minutes in operation, the red "signal limit"
lights and cuts off the sound, even with no cable plugged.

What reasons for this light comes on?

I believe not be heating because the cooler is functioning normally ...

Any idea? Thanks !!
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