Speakers don't work after restart the car within 1 hour.

[bashett]

For 3 months I own a BMW Z4 e85 where the previous owner has placed an after market android tablet of the brand Topway. I'm having problems with the audio from the start.

When I start my car after a few hours or days, the speakers work. If I turn off my car and start it within 1 hour again, the sound suddenly doesn't work. So I don't have this problem if I start it after a few hours.

What could be the cause of this?

[Clearancediver]

Amps have over heat cut out circuit if I remember what I read correctly. It's possible that it's heat soaking (or finally reaching its cut off level) after the ignition is switched off. Perhaps the tablet is keeping the amp on causing an over heat issue.

I would monitor the amps temperature…. Feel how warm it is after a fixed period of time… right when switched off and when you go to restart.

I had changed a radio/amp and the combination heated the amp up to a point it was too hot to touch… it wouldn't "speak" at that point when I switched it back on…