FYI I ran this overnight, it had the same bug as some of my builds where it dropped off the blockchain and never recovered. Woke up this morning to find current block was way behind.
Yes, I have had this problem with several of your builds and the generic build based on Cheimisists changes (
https://bitcointalk.org/index.php?topic=253662.msg2716037#msg2716037) as well, but not the release 5 build. The strange thing is that the problem doesn't occur right away, I have observed it getting stuck on the same block after working flawlessly for 7 hours. I don't end up with any orphans though, I only observe that it's working on the same (old) block for a very long time.