[Zope] ZSyncer trouble with large Folders

Well I really like the function of ZSyncer, and I'm using the latest (0.4.3). Oh, I see there's 0.4.4 - but here's my problem.... BUT, we sometimes get into trouble with large Folders. Of course our developers constantly grow these anyway. I would assume that we're getting TCP connection failures due to checking a large number of objects. Sometimes I get "page not found" or "Internal Error" or occasional a Zope/python error: "IO/Error" after a Sync. After this last, I find that ZSyncer has worked after all, but it's terribly frustrating at times. I'm resorting to Export/Import to ensure things happen the first time round. Has anyone come across these issues? Any suggestions? cheers Graham