Just bought a new Toro Z-Master to replace my old one and I love it except for the deck noise. It has the turbo force deck and with the blades engaged there is a horrible resonating roar that fades in and out. It's really loud even with my hearing protectors on and I can feel it in my chest. Has anyone else experienced this and is there a fix? I'm planning on trying a different set or blades to see if that makes a difference.