Other day I made this thread -> http://forum.square-enix.com/ffxiv/t...NOTHING-AT-ALL
Getting rather angry that I've been DC'd from a dozen or so attempts from Air Force One, missing out on a possible 4k MGP per attempt, which adds up. In the last day I've stopped using the spacebar to fire at the targets, and I have not been disconnected at all at this point.
I'm mainly saying this because I believe the issue was me using the jump/spacebar to fire at targets. So this is only a guess, but maybe there's something causing issues in the game when you're 'jumping' in an instance you can not jump in.
I'm not 100% on this, so take it with a grain of salt, but I do strongly believe that this is what was causing my constant DCing, as I've only used my mouse now to fire at all.