Skipping problem We actually have a model similar to this (PVS69701). It had started skipping when hitting a bump in the road, but now it even skips when we are parked. We have tried a DVD player cleaner and have tried numerous brand new DVD's in it, so we know it's not the DVD itself. Any ideas what we can try next?

Sounds like you have an ignition misfire, check the plug wires and spark plugs.

Search the internet for:

Make + Model + the word "Manual"

or contact manufacturer support. Most machines are threaded similarly, so even if you can't find a manual for your model, a manual for a model similar to yours will be helpful.

You can also search YouTube videos for threading instructions.

When threading, be sure to always raise the presser foot during the upper threading process. This releases the tension disk and allows the thread to seat properly.

For skipped stitches, try installing a brand new needle.

What to Do If Your Sewing Machine Is Skipping Stitches

10 reasons for skipped stitches

Basic Maintenance Tension Skipped Stitches
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CD disk bad. (audio disc bad or scratched)
or CD dont really support disk media format , is this a CDDA or MP3
some early MP3 disc drives do MP3 very poorly
or skips when you hit bumps in the road.
only that disc skips.?

That's normal in most cars!

are you playing CDs while this happens?

ill bet your CD is skipping on bumps.

play your radio or ipod input and run some rough roads...ill bet your 'pause' goes away.

throttle position sensor, clogged catalytic convertor

This can happen for several different reasons. 
1. The dampers (oil filled shock absorbers) are leaking and need to be replaced. You can check this by taking the unit out and opening it up and then remove the CD deck. In each corner of the CD deck you will see a small rubber looking device that the internal mech floats on when a disc is engaged. It is attached to the internal mech by only a small metal peg. Check each corner for these. Make sure they are not leaking anything. It is usually a white looking substance that feels like grease. Ant time even one of them go bad or get popped out of place, it will skip on every bump.
2. Try cleaning the lens. Sometimes a dirty lens will make the CD player skip much easier than it is supposed skip. You can buy a cleaning disc at most retail outlets that sell CD and DVD players. Run it as directed in the instructions. 
3. one or more springs are streched out a little. These mechs have many springs in them and if one is a little streched it will cause skipping. If you find a loose spring, it will need to be replaced.
4. Weak laser output. A weak laser will also cause a unit to skip. If this is the case the laser pick up will need to be replaced. There is no fix for a weak laser other than replacing it.
5. Spindle motor problems. A spindle motor with even a tiny bit of oxidation in the windings can cause skipping when you hit a bump. 
There are also a few other things that can cause this same issue. It is not an easy thing to fix without some training on this type of equipment. 
Is this an "Aiwa"  or is this a factory unit that cmae with the car when it was brand new. I don't think that Aiwa is an OEM radio, but I could be wrong. I fix aftermarket radios only.  So I am not real familiar with all the OEM models. 
If this is an aftermarket Aiwa radio, you should take it to a service center to get an estimate. If it is an OEM radio, it is most likely going to be very expensive to fix and a good aftermarket radio would really serve you better. 
I am sorry if this is not the answer you were hoping to get, but it is the truth so I hope you will not punish the messanger for bringing bad news.
Anything less than a "helpful" rating is a very bad rating meaning that you got no help or that the help was not related to the problem. I spent a lot of time putting this information out here for you for free, so I only ask that I get a decent rating for my trouble.
If you require any more help feel free to post another comment on this thread with any questions you may have. I will be happy to answer them for you.
Dave

try cleaning the lazer lens, also remember it is old and is most likly toast., the longest I ever owned a deck that didnt go out was 4 years.

Did your music subscription service expire? That would cause it to read every song as zero. Definitely try the rest method first. Disable auto-synchronization feature for all programs that you sync the device to.

Is it anti-skip resistance? If not some players have hard problems playing when heavy bumps. Also is it installed correctly? Was all shipping plugs taken out?