Your Campaigns would usually get automatically paused:
1. When you’re Campaign runs out of its Daily Budget. Your Campaign will be automatically Activated the next day – given there are funds available in your account. You may choose to allocate a higher Daily Budget. Or adjust the Delivery% to control the rate at which the Campaign is delivered.
2. Or if you’re Campaign has expired. You can re-activate an expired Campaign by providing a new expiry date.