Sony BDP-S6500 stopped playing DVDs

[Blu-grass]

My Sony BDP-S6500 suddenly stopped playing DVDs. It gives this message: “Unable to play this disc. Check that the disc can be played by this unit and there are no scratches or fingerprints on the disc. The disc might not be finalized.”

I’ve tried multiple discs, including brand new ones and ones it has played in the past. Shortly before it stopped, I noticed sometimes it would leave small scratches or marks on DVDs that weren’t there before.

It still plays BDs and music CDs with no problems.

Is this fixable or should I just get a new player?