Anybody else have any issues with echos shc-1500? I only use mine once a month for about 30 min or so, but frequently the blades stop moving but the engine doesnt. I have to take off the bottom cover of the gearbox and take everything apart, reinstall it, then itll work again. there are no signs of rust sticking the blades together, although I dab some grease inbetween the blade to make sure it moves freely. the gears are in good shape and there is some grease in the gearbox. I use amosil grease which is sort of thick, but does that make a difference? Should that gearbox be paked with grease? if so, what kind?