Hey Blizz,
Desyncs for the custom game Final Fantasy Epic RPG are pretty consistently horrible. You can see the link for the map at the hive workshop here: https://www.hiveworkshop.com/threads/final-fantasy-epic-rpg-0-9-5-2.267465/
Desyncs seem to cut out half the players (assuming a full lobby) every time at the very beginning. I’ve tried restarting wc3 and telling others to do the same to avoid cache problems but it doesn’t tend to matter, it feels more like a lottery of which half of players are going to get kicked out.
One good thing is that after the game has begun there are no desyncs so its limited to the very start.
Hope you guys can figure it out!