i originally made the appearance on a na one, i was never able to log in due to the 90000 error, not even the beginning animation would start. so i created character on a jp one and it worked. then after this i used the same appearance file from the character i created in the na one and it failed with the same error as before, even though the other character works fine. im still having problems with all na and eu servers. even still all characters on this jp sever seem to work fine unless i use a character appearance made earlier perhaps from na servers which seems very strange to me.

for your causes its most likely not 1-4
if its 5 then its not an error from my end, all other online games work fine without lag or packet loss.
i should also note that the severs that are working form me experience no lag and i haven't been disconnected at any point from them