Hi guys, my first post on here.. I have been flying a tello for a month or so and love it.. I noticed this morning that one of the props doesn't spin freely when turned manually.. Ie it is a lot stiffer than all the others. The drone still fly's normally but im guessing that motor will be draining more power in order to maintain the same revs as the other 3. Any ideas on how to fix or will it need replacing? many thanks and happy new year..