An Uber account can be frozen or "deactivated" for several reasons, ranging from simple paperwork issues to serious safety violations. The most common reason is an expired document, such as a driver's license, insurance, or vehicle registration. If you are a rider, your account might be frozen due to payment fraud or multiple "failed" payment attempts that trigger security flags. Uber also freezes accounts during background check renewals, which occur annually. More serious reasons include a low star rating (usually below 4.6 for drivers) or reports of safety incidents, such as altercations, impaired driving, or "inappropriate" contact with other users. If you haven't used your account in over 90 days, it may also be temporarily suspended for security. To resolve a frozen account, you should check the "Help" section of the app or visit the Uber Review Center, where you can see the specific reason for the hold and submit documentation or a request for a manual human review of your case.