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The issue usually related to more than one possibilities. First possibility; the obstacle in front of laser beam lens. Sometime by natural causes the DVD lens collect tiny amount of dust which makes the laser reflection on CD weaker. since copied DVDs has different track structure it might be better reflected.
Second possibility is your region code has been changed. Copied DVDs usualy come with region "0". You might try to set your region again.
You may perform lens cleaning by obtaining an easy to find DVD cleaner set.
make sure to use lens cleaner to ensure DVD player is free of dust and dirt on laser lens
another cause would be that your DVD player is no multi-region or not region free, because many DVDs have region settings. in order to make your philips DVD player region free (can play all region DVDs) check link below:
DVD region number (playable region number)
This DVD head unit will play back any disc
whose region number is 2 (or All). DVDs
with a region number other than those listed
below, cannot be played on this DVD player.
The screen will show: "Region Code: 2" Press [1-6] to manually set the region OR  for multi-region.
Press [SETUP] to exit
You will now be able to play DVDs from anywhere in the world.
This is particularly useful, because region 1 DVDs from the US often come out when the movies are still in the cinemas over here. Region 1 DVDs can be bought perfectly legally by mail order or from the internet.
it depends on whether the drive is multi-region ?
Some drives are region Set, i.e Region 1 ( NTSC-USA )
Region 2 ( UK PAL )
Most Players Are Region Set, To the country they are purchased in, you can sometimes set the player to become, multi-region, via various buttons on the remote or by the front panel.
I offer a service to unlock 99% of DVD Players, to play all or many regions.
We do have a charge for this Service.
Many Thanks mike @ Compurepair.