Hi, first time poster here... I'm just your average Joe Homeowner who cuts his own grass. I've got a Toro mulching mower that I picked up at Home Depot about two years ago. Recently I have noticed the mower is leaving more grass clippings on the lawn than normal. I sharpen the blade and change the oil regularly. I have checked the mover to make sure there is no grass clogged anywhere. I don't know what else could be causing this. Any ideas from the experts?