I have been driving since September and never got anything worse than a low rating. But within the past three weeks I've gotten three messages from Uber support about passenger complaints that were totally bogus. One claimed I was driving a car that was different than the one shown in the app - totally not the case, never done that. One claimed that I had a friend in the car who was not an Uber passenger - again totally not the case, never done that. The last one claimed I looked impaired while driving - again totally not the case, I don't do drugs or alcohol. That one resulted in a temporary (I hope) account suspension until I replied to it.