Warn laser maxine, and the cold disc is making the laser scan out of track, once warm it falls into line.

Replace laser.

Like admranger suggests try burning the backup to a different dvd, this sometimes helps.

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Sept 03, M3, Silver Grey. Retro-fits: Modded Mk4 DVD Drive, OEM Bluetooth, VR Control, Rainbow Speaker Upgrade, Sony SOT Amp, HK Sub, CCFL, Intravee II, NightMode.