@fatherazrael - Did you manage to set some resolution on this? We have been stumbling upon similar mysterious consumer-down issues with no path forward! We suspect Azure side issue to force an upgrade to Premium Tier, which is compatible with Microsoft Provided Azure JMS Library again dependent on Qpid JMS client!
Azure Service Bus: JMS 1.1 + Qpid - https://learn.microsoft.com/en-us/azure/service-bus-messaging/service-bus-java-how-to-use-jms-api-amqp
Azure Service Bus (Premium Tier Only): JMS 2.0 + Azure JMS Library - https://learn.microsoft.com/en-us/azure/service-bus-messaging/how-to-use-java-message-service-20