I've only mowed with my CC 2166 only around 5-6 maybe 7 times, and I've noticed that when mowing at about the same speed as when it was new, that I am now getting a strip of grass on the discharge side that isn't be cut as cleanly as before. I don't remember hitting anything, well, maybe a few small sticks here and there, but are my blades due for a sharpening? I removed the mulch plug and have been side discharging to see if it's the plug causing the problem, but it hasn't up to this point. I've had to really slow down quite a bit to get a clean cut, but maybe it's also attributed to what I'm cutting? My lawn has become a clover field, and it seems to be worse with clover than with grass, but it still does it a little when I'm cutting only grass. Any ideas?