My rainbow e2 black ask of late is sounding like there is no foam sound insulation in it. Some times it's the real loud high pitched whining sound other times it's fairly quite. I have tried the separator evey way imaginable and it's still loud. I had it cleaned last month and when I got it back it was so quiet. I even carefully removed the top and inspected it to see if the insulation had shifted. My e2 gold would do the exact same thing sometimes it was quiet other times it was loud. Anyone else ever notice it being louder sometimes and quieter other times.