The fact that it is intermittent strongly suggest something on
Mozilla's end, but this isn't enough information for me to diagnose
the problem. If there are specific situations under which it
occurs, that might lend a clue.
Just added a third machine and wanted to sync it with two
others. Sync totally TRASHED everything. Everything is rearranged,
if not erased 70% of my bookmarks. Had them backed up and the
backup won't load. There use to be a great sync add-on that just
disappeared and it beat the built-in sync hands down. Now I have a
monumental mess to clean up. Just might scrap it and go to Safari
instead, since I'm basically starting over. The is pure crap.
Bob, there's no need to be unpleasant. You didn't pay us for
this and we're all volunteers here. Furthermore, as Chris pointed
out, the sync server side is not under our control and "sync
doesn't work" doesn't give us much to go on.