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This can be caused from a number of things. A motor going bad, a bad start capacitor or even a fan cage that isn't aligned properly on the shaft. Check the alignement first to be sure it isn't rubbing and then get a hard start capacitor kit and install that and see if this resolves this. Hope this proves helpful here. Please get back to me if you need more as all follow ups are included in our fee.
Just checking back in to see if you got this resolved or do you still need some help and additional input from me here?