Dual Headrest DVD Player Problems

[Guppy]

I was wondering if anyone else out there has had the Factory Dual headrest DVD Players installed and if so have you had any of the following problems.

1. when you try to listen to the DVD through the FM radio, do you get stations bleeding over the DVD Sound? or does someone know how to change the preset frequency on the DVD units to another?

2. Does anyone hear the engine whinning sound when listening to a DVD through the radio?

3. Has anyone had certain DVD's skip or not want to play in the players? Mostly back up copies. I have a van with a DVD player and I do not have this problem.

Thanks.