One of my motors has started to make a clicking sound when I manually turn the prop. I have taken it apart, cleaned and blown it out but it still clicks..I'm having no issues with flying it but I know this isn't normal...Yes I have crashed a time or two but nothing hard core.....my question is should I replace it before it drops from the sky or do you guys think it's fine to keep flying....Again when I turn by hand it clicks but doesn't have any more resistance than the other motors....its a Brother Hobby returner 2207/2700 kv.