the problem is with your writer. replace it if it is under warranty. OR IF U HAD ALREADY MAKE GOOD USE OF IT THEN BUY A NEW ONE BECAUSE AFTER A CERTAIN PERIOD OF TIME THE LENS BECOME WEAK AND START SUCH TYPE OF PROBLEMS. DONT BUY LG AGAIN . GO FOR ASUS INSTEAD
I thought LG makes some of the best optical drives which are the best in reading scratched dvd's which other drives refuse to read.. As for lens quality and best burning results, i trust Sony above all.. And switch to IMGBURN for burning your data..