I had just returned my machine for another one because it locks up after making only one batch of drinks. The shave only doesn't work at all! It worked the first time and will only blend the second time. No shaving of ice. How do i get this to stop! The machine will finally shave ice if i wait about 30-40 mins after using it once on the shave and blend setting. If I have a party and need to make six drinks, it would take me over an hour! Anyone have this problem and know what to do? There is no way i got two lemons in one week right???