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I have got a problem with my 250 while flying in cold weather... The rotorhead gets stiff and paddles are very hard to move... this causes very sluggish controls and the heli is very hard to control and after a new input she doesn't come out of the previous one... I have lubricated the parts with WD-40, could that cause the problems I am having? And if how to get it out of the parts and what to use as a better lubrication?