Its probably never getting fixed unfortunately. ArenaNet just does not care because it affects a small % of users. For me it was always in an instance just before a cutscene needed to load and I could reproduce that issue probably 85% of the time, which gets old real quick having to replay stuff over and over again. ArenaNet support just wants to pass the issue off onto my ISP and isn't interested in having a developer investigate the issue. If the issue was they couldn't reliably reproduce the issue I figured they'd be interested to see why I could reproduce it on demand but they just don't care. I just moved on to one of a dozen or so other MMO's that I've played over the past 10 years for hundreds of hours with no disconnect issues.