When I put a DVD in and push play it will only play for a few minutes then it shuts itself off.

SOURCE: Help

Try "hiding" the remote so that the player cannot "see" it, This will eliminate the possibility that the remote is stuck on, and thereby "operating" the player...accordianman

SOURCE: DVD plays for few seconds and shuts off

There are two possibilities

1. Do you use rechargeable batteries supplied with it? If yes it can be malfunction of batteries try to replace it with new one according to it's specification.
2. If you don't use batteries and have direct power supply then then capacitors of it's power unit are weak.
   

Try to count the time in which the dvd power itself off. If every time it is same then option No: 2 is correct
Here is the last option as i think.
Reclaim your warranty (if it exist).
If your product does not work properly because of a defect in materials or workmanship,
Panasonic Consumer Electronics Company or Panasonic Sales Company (collectively
referred to as “the warrantor”) will, for the length of the period indicated on the chart below,
DvD Parts = 1 year (Starts from your buying date)
Labor or repairing = 90 days (starts from your buying date)
Rechargeable batteries = 10 days (starts from your buying date)
which starts with the date of original purchase (“Limited Warranty period”), at its option
either (a) repair your product with new or refurbished parts, or (b) replace it with a new or
a refurbished product. The decision to repair or replace will be made by the warrantor.
During the “Labor” Limited Warranty period there will be no charge for labor. During
the “Parts” warranty period, there will be no charge for parts. You must mail-in your
product during the warranty period. If non-rechargeable batteries are included, they
are not warranted. This Limited Warranty only applies to products purchased and
serviced in the United States or Puerto Rico. This Limited Warranty is extended only to
the original purchaser and only covers product purchased as new. A purchase receipt
or other proof of original purchase date is required for Limited Warranty service.

If you are in USA and your product is in warranty period then reclaim your warranty.Contact me again for any suggestion
Thanks

SOURCE: I have the Philips DVP3150V/37 DVD Player / VCR

The 3150 has two belts or bands that can slip when old, just like the old days. One is for loading the cassette and the other is for providing take-up torque for the tape. Have also seen the tape loading arms get out of sync and don't put the tape around the heads..... working on one now but dont have a fix yet..it has the loading problem.