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My car stereo keeps switching source to USB

My Pioneer car stereo (DEH-P8400BH) keeps changing the audio source to USB, even when the unit is switched off it will turn back on and switch to USB. This issue started this week when the outdoor temp started dropping below 0°F.

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Hi,

Is there anything plugged into the USB ports that connect to the stereo unit?

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No there isn't anything plugged in.

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Hi,

If it is set to on, try turning the USB plug and play option off and check if the stops it from happening.

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