Just bought another one last weekend at the NARBC show. I was checking temps and noticed the "on" light would constantly stay on regardless of where I put the temp on the controller. I felt the UTH and it was very hot, definitely not the 90 degrees it was set at. After some fiddling, it started making a very strange noise, almost like the noise from when you turn on hair clippers. Anyone ever experience this before? I'm thinking it's a dud