Are you running FM Pro and FM Server on the same machine Frequently, only for maintenance purposes after hours, or all the time?
Thanks for posting!
Does the hang correspond with back ups or any other events?
Is this a dedicated machine?
What's the fmserverd process doing during an episode of this (i.e., is it at 100% CPU usage? Is it running at all?)?
I just noticed that I've never answer this topic I had created. I found out that the backups were done on a second hard drive, and it was almost full. Keeping less history lead to more free space and the problem gone!
Sorry for this (very) (very) late answer!