回复队列不会使用回复

I'm sending messages with InOut pattern to a JMS queue and set the replyTo to a predefined queue. sometimes everything works fine and sometimes camel wont read replies from that queue and fail with TimedOutException. sometimes I can see 2 or more consumers on the reply queue (using AMQ web console) but camel wont consume it. I'm sending messages with InOut pattern to a JM