When my LiteOn drive run hot, they tend to encounter more errors.
So if I burn a disc and immediately scan it, I will get more errors than if I waited.
When I had issues with my old A1H, they would occur after the drive had a chance to heat up a bit.
Did you burn the disc and then scan it, or…? Did you scan one when the computer had been on a while, and the other after a cool-down? Or some other situation where the temps might be different?