Well... I would suggest you trying to update the firmware. Use only the official firmware from Philips site. If my memory does not fail me, the firmware version of DVP630 is the same as the DVP642, but you have to check it.
If your problem is not solved, you can ask for an exchange. Philips models have lately "some issues".
P.S.: Before upgrading you can contact Philips Customer Services and ask for an advice, don't forget to ask what firmware to use, if this option is applicable.