No,the scanner no any problem.
That distortion of reason is the self healing fuse(Y driver) action!!!
And the self healing fuse action reason is the via the coil of current too high.
And the coil current too high reason is the speed and angle too high.
So you just set the speed lower and the angle not too width,then everything done.
Also even same angle and speed,but some bad software would be create more heat,the self healing fuse same action!!!
When the self healing fuse same action,you need close the scanner(off the powersupply)20-30 secs.after you can runing the scanner again,at the same time set the speed lower and the angle samller.
Jian