I've been running my G350 for a while now and though it appears to run fine, I am a bit worried about the noise levels on the Y-axis. A straight line from left to right is almost silent. A straight line top to bottom makes a humming noise, a curve makes more noise as the Y-axis slows down (so close to the 'top' of a circle). It seems the Y-axis makes more noise as it goes slower. Sometimes the whole machine is resonating due to the vibration caused by the Y-axis movements.
I read somewhere about a faulty driver causing this. Should I be worried?