Philip DCP750/37 turn black and white

Hi I hope somebody can solve this, It sounds easy but we really try and follow the trouble shooting guide but nothing happen. We bought a Philips portable DVD model DCP750/37. The first time i use it, works really well the after 30 minutes of watching my movie. It turn black and white so i turn it OFF and turn it ON again, so it back to normal. Then the following day i let my son watch his favorite cd after 10 mins of watching, again the same problem as yesterday then the next time we used it, its totally black and white and we follow the trouble shooting guide nothing happen we did not return the product 'coz we are in The Bahamas and we bought it in Florida.
I hope you can help me.