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Unplug the unit, remove the cover and clean the laser lens glass with a Q-tip. Spray a bit of window cleaner on one end of the Q-tip (over a sink), then use that end to clean the objective lens of the laser. Then dry it with the other end. Wipe Carefully!
Do not apply pressure while cleaning, wipe slowly and then reassemble the unit and test. This is a common problem on many laser-based products, dust and smog get inside the unit and cloud the lens, causing it to skip or not read at all.
the most likely problem is a weak or failing optical pickup. try a cleaning disc first there may be dust on the lens. do not use any liquid to clean the lens. remember this is an optical system if it can't focus properly or "see well" it can't read.