First, clean the DVD player lens by using a DVD/CD cleaning packet available in BestBuy, CircitCity, Radio Shack, or any electronics store. A dirty lens has reduced strength of the laser beam.
If this doesn't fix the problem, there is a chance that your physical DVD is defective. Try to make a copy, usually copying on a good disk solves the problem.
If none of the above measures can fix the freeze problem, then you have either non-standard MPEG video streams, or non-standard DVD authoring. Usually the low end DVD authoring programs don't conform to the International DVD Consortium standards completely, that means a number of DVD Consortium standards are skipped, simply because of the level of the program and the cost. In this case, a higher level of DVD authoring program is need.
We offer you the industry standard DVD authoring 100% conforming to the current DVD standards, and the future BlueRay DVD standards.