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I've seen others with this issue as well. The server appears to 'time out' and even tells us to repost in 30 seconds (hence why you're seeing people post the same thing 3,4 times). I've learnt to live with it. But think of things from the vantage point of a prospective customer: If the message forum is broken what does that say about the software?
Rhino3D and Sketchup use similar (I think the same host?) message forums and those seem to be among the most reliable and user friendly forums out there.