Up until about 6 months before I stopped playing, my internet was crap. I'd DC at specific zones, whenever I tried go somewhere busy from somewhere busy. Windy to Whitegate? Fine. Whitegate to Jeuno? DC. Jeuno to sauromugue? DC. Al Zhabi to anywhere? DC.
To be honest, I'm amazed I lasted as long as I did. The 1000000th time you lose a party invite because you DC for 5 mins and get replaced makes throwing in the towel look mighty appealing.