Hello.
A convoy is one way to fix your problem. I have run into a similar issues in the past and used a convoy to correct them.
You are getting OOM with only 3 messages?
The problem you might be seeing is the HTTP Connection Limit defaults to 2 – if I remember correctly. You need to change this setting inside… the BTSSrvc.exe.config file I think. Although, I didn’t think this gave an Out of memory exception though. I think there is a KB about this
I couldn’t find the exact KB, but this one covers OOM issues: http://support.microsoft.com/kb/918643/en-us
Hope this helps.