This is my first year dealing with a reel mower. It started out OK but for the past few weeks the mower has been leaving uneven marks and burning the yard every time it hits a bump. 3 of the yards I do have somewhat "bumby" terain and the grass looks more like a large green dalmation. The blade does need to be sharpened, but it did the same thing right after I had it sharpened. Am I mowing on too high of a level? Most of the spots that I am having a problem with look like the grass was grey underneath the top layer of green. I am really at a loss and no one seems to have an answer. I would appreciate any words of wisdom.