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Discussion Starter #1
I've had two double-DIN Android-based head units (different manufacturers) inside my Peugeot 308 (2012) and both intermittently dropped any sound to my speakers, leading me to believe it's possibly the wiring loom from the car itself that goes into the head units.

However, moving the loom around does not bring the sound back. It will just come back on its own after a few days.

The sound to my subwoofer (seperate cable, a phono cable from the subwoofer) continues just fine.

Any ideas?
 

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Forgive the pun..but its sounds more speakers than head units. Are they impedance matched ok ? If there is crowbar protection on the amp output the amp may well lock out until its happy to power up again. That would usually only be minutes but you may just turn it off for piece of mind when it plays up and not notice it for days. Is the sub-woofer supplied from the same 12v bus as the head units because if so, you can at least rule out that factor.
 

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Discussion Starter #3 (Edited)
Forgive the pun..but its sounds more speakers than head units. Are they impedance matched ok ? If there is crowbar protection on the amp output the amp may well lock out until its happy to power up again. That would usually only be minutes but you may just turn it off for piece of mind when it plays up and not notice it for days. Is the sub-woofer supplied from the same 12v bus as the head units because if so, you can at least rule out that factor.
I'm not sure.

I know that there are three cables coming from the subwoofer.

One goes straight onto the car battery.

Another is an RCA-to-RCA cable that goes to the 'subwoofer' RCA port on the head unit.

The final goes to the 'auto ant' on the head unit, to turn the subwoofer on when the head unit is powered up.
 

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Discussion Starter #6
I bought a Pioneer MVH-A200VBT (£130) today and installed it.

Driving to some shops (20 minutes away), everything was fine.

After shopping, I turned the engine on and had the same familiar fault - could only hear the subwoofer.

After a few seconds, the head unit started to flash: AMP Error.

So it wasn't an issue with the Chinese Android-based head units after all :(

Does this help you, perhaps, narrow down what the issue could be and how I could go about fixing it?
 

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"amp error" leads me even more towards a speaker impedance miss-match, bad speaker connection, or possibly reverse polarity speaker. Modern mosfet final stages are sometimes sensitive to what they see at the load. Definately check continuity(actual OHMS and not just a beep test) and see if there is na impedance option in the speaker menu. If its seeing 8 instead of 16ohms the output may well shut down after a period of seconds. This smacks of something very simple but quite destructive.
 
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