Liteon 52246s errors

using Liteon ltr 52246S, firmware 6S0F, keep getting either one of two errors…SCSI/ATAPI Command TimeOut Error or Speed Calibration error. Using Nero 5. I am even trying to burn at 16x and still get same errors. Very noisy and won’t read some commercial discs to play them. Most recordings go to 3% and then it seems to be adjusting speed, takes forever and sometimes it just errors out there. Sometimes it will burn most of the cd and then error out. Have tried with Fuji’s, Sony’s and Imations…all the same. Pulling my hairs out…

thx
jmb