Service Bus Error: The maximum entity size has been reached or exceeded for Topic

One of my customer suddenly started seeing the following error message:  Microsoft.ServiceBus.Messaging.QuotaExceededExceptionMessage: The maximum entity size has been reached or exceeded for Topic: ‘xxx-xxx-xxx’. Size of entity in bytes:1073742326, Max entity size in bytes:1073741824..TrackingId:xxxxxxxxxxxxxxxxxxxxxxxxxx, TimeStamp:6/30/2013 7:50:18 AM   What went wrong? Luckily this error was self-explanatory and indicating that the Max Topic size is 1…