Lite-on LDW-851SX and discs!

HELP PLEASE! iv got me 1 of the above and tempremental it is,sometimes it copies… sometimes it dont! i use + and - 4*speed and find im wasting 4 or 5 discs at a time! i use sonic record now, record dx and even nero and am still having the recuring problems. im new to this game and im finding it frustrating now some1 please give me some info… thanks to all.

try burning at a lower speedm and using different media