2007 Prius Very Loud Static Noise from speakers

[FATech67]

2007 Prius is experiencing an intermittent very loud static noise coming from all speakers. It is so loud that it sounded like a train crash three feet away. The loud static will continue even after the radio is turned off. The static seems to occur after driving 1-3 hours. The car is a single owner and has never been in an accident. There is 67,000 miles on the car. There have not been any aftermarket additions. Once the static starts, the only way to stop it is to pull the radio fuse from under the hood.

The Prius has the JBL system with the Amp under the RF seat. I attempted to go to the Toyota dealer (Wiesbaden, Germany) and they could not duplicate the problem and suggested they keep the car and send off the head unit and it would take 4-6 weeks (I can't give up my wife's car for that long). I also attempted to have an aftermarket audio installer to check for shorts (he wouldn't touch a factory installed system to troubleshoot???) I miss being back in the States.

Can you offer a suggestion on cause and correction of intermittent loud static noise coming from all speakers.

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[CrossoverOre 10+ year member]

turn on system let play for 1-3 hours and smack the fatory amp. doesnt have to be that hard but I'm thinking its the amp. also kinda wiggle the plugs a little at the amp itself but i do think its an internal amp issue.

 

[FATech67]

The loud static seems to occur faster during the hot weather vs the 1-3 hour drive (???). I have no idea why this is a factor.

 

[CrossoverOre 10+ year member]

Heat is the factor. components inside the amp are failing when they get too hot.

 

[FATech67]

Is there a way to check the Amp for an intermittent short or just replace it. This is tough to diagnose without a great deal of time invested to heat up the car (1-3 Hours) and duplicate the symptoms.