Hi Robert,
Did SAP ever respond/resolve the ticket you created for this issue? Someone told me that this was a known issue, but I have yet to have it verified by SAP. They asked me to simulate the issue - but our non-prod systems are on a VM server with other systems. So I can't exactly start pulling network cables out - I did drop it from the network a few time while sending IDOCs down - but this failed to hang the processing of the IDOCs.
We're hopefully going to MII 14/15 next year - but the business is keen to resolve this issue as it has impacted production a few times. The MII sites are in some remote regions and I don't think we can really improve the WAN links much further.
@Christian - thanks for the link, we don't really have an issue with IDOC's not being received, its just the message processing just hangs and we either need to restarted the services or sometimes the system.