I already posted about this exact issue last week, as I noted back then the D/Cs happen (for me at least) with WAY more frequency in the FC housing areas and in boss rooms before/after (but not during) fighting the bosses. I haven't seen any error codes though...Just "you have been disconnected from the server" at which point I can instantly log back in.

http://forum.square-enix.com/ffxiv/t...47#post3152547