Squealing sound
are you listening via FM transmitter function?
if so, make sure that you do either.
1) when watching the same DVD on both screens, disable the FM transmit on one DVD.
2) when watching separate DVDs on each screen, make sure that the frequencies are separate by as big a gap as you can make.
I had this problem and it was due to both screens transmitting on the same FM frequency and interfering with each other.
I also found that the lower FM frequencies stopped my GPS from working!
After altering the FM transmit settings (FM-TX) button on remote, it was all good.
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