Are you sure you don't have a consumer hanging for the in deliveries.
I have no other bugs raised around this. if you have an issue I will need you to provide a replicator. It could be some unbehaviour from your app such as hanging a consumer.
I think not, but not sure - I should I check it?
Make sure you are not letting consumers/Sesisons open. also make sure you are using the proper session isolation (one session per thread).
Look at your logs for any warnings.
Ultimately I would need you to produce a test replicating your issue. Start by simplifying your example to a simple application. you may end up finding what you did wrong.