About three weeks ago I bought one 6055. Nice little pump and it moved some water and seamed pretty quiet. So I just bought the 7095 controller and a second 6055. Set them up to alternate back and forth. Every time they start up I hear this click. Once every thirty seconds is very annoying. The newest 6055 also seams to hum a bit. Is ether of these two things normal? (I hope not)