One propellor seems to click as it turns, is this usual?
It is the last to spin when the drone powers up. It does spin in high power mode but the drone is not balanced and drifts in the direction of the propeller in question when it takes off. The other propellers spin freely, this one seems to ‘click’ slightly as I turn it. This model is X5UC
3 
I had one, same issue, binned it. You can buy spares for them. Check eBay.
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