Sub amp turn to protect only when driving

[blackmu]

Hi i have an amplifier gm9701 pioneer when i start my car on idle and even when engine off it play well but when i start driving my sub amplifier turn to protect then back to normal then protect again then normal it goes like this....can anyone help?
-i've I've already check all my power cables
-I've already check my sub and enclosure terminal
-i've already check sub terminal on amplifier

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[audiobaun 5,000+ posts]

Hi i have an amplifier gm9701 pioneer when i start my car on idle and even when engine off it play well but when i start driving my sub amplifier turn to protect then back to normal then protect again then normal it goes like this....can anyone help?
-i've I've already check all my power cables
-I've already check my sub and enclosure terminal
-i've already check sub terminal on amplifier

Id pull that amp out and either Bench test it yourself or have an Audio shop do it with a load on it.