* using different brands of discs, with different speed rating;[and stick to that.]
* Burning at a slower speed;
* Cleaning the lens of the burner;
* testing before burning so you do not create coasters;
* putting in a disc only when the program asks you to, not before.
* downloading and installing the latest upgrades or version, if any.

What is the error message in full, if any ?
Your burner may be wearing out. Time for a new one ?