Hello, I had the same problem with my up6/e for 2 times in 7 years of use, both the times I had the pump repaired for free by sending it to Marco, Italy. After the last time, I decided to change the position of the pump, which was operating vertically, to the horizontal setting. At Marco, they say it shouldn’t matter, but the problem happened two times on the bearing supporting the weight of the rotor. Hope this helps