Syma x8w problem

Hello i am new to this forum
Recently i was flying Syma x8w quadrocopter , and today i wanted t0 fly too , but it couldnt start
There is 1 prop blade that moves slower and when i move it by myself , it makes weird sound not as the others
Please help me i want to fix it

 

Hello i Fixed it , if anyoen will have the same issue just try greasing motors

 

Ok, could you describe how you greased the motors. Our X8W is having the same problem.