Summt if only a little water runs

If only a little water running, humming this mixer. This is very annoying when a bedroom is on the back wall of the shower, where the morning then someone else is sleeping longer. We got a complaint and installed by the customer a new Grohe. The free Grohe service was good, but the new mixer hummed then after a few days again. We had the last 8 years before a 40 Euro mixer tap of a hardware store, which made no noise. This one I would not buy again.