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I gighly recommend that you return the fan for a replacement while under warranty. Rhe noise is from a defective winding in rhe motor. It can only be repaired by a motor shop. Since it's under warranty, you shouldn't concern yourself with this type repair, it is not a DIY issue as attempts to repair it would void the warranty. Thank you
Hi, I'm Mike G and I'll be assisting you. I suggest checking the ball connection notch being set. If you can turn the motor, not the blades, it isn't set which makes the alignment off and will cause a rubbing noise. Let me know how it goes.
If it looked slightly off set is why I wanted you check the ball. If you spin the blades does it make a rubbing noise? If off set it may be the ring the blades are attached to that is rubbing. The housing on the motor may be moved slightly by pushing on it to try centering or pushing the blades to center it. These are the only options for the problem. Let me know how it went.
The last thing to try is to pull down on the blade where you hear the noise. If that doesn't solve the problem not being there makes further suggestions not possible.