- If this was a server global timing issue, then the problem would be universal across all players, zones, and instances. It's not as illustrated by OP.

- If it's a matter of FFXIV is experiencing it, and other games not, that could be a routing issue. Though if people are not experiencing it in the overworld, it's not.

- If it's a matter of certain high-popularity fights experiencing it, and others not (Example, Titan HM vs Titan Story.) It may be a congestion issue.

Number three sounds like a likely candidate, IMO seeming we've buckled the servers since Beta 4 and have needed two upgrades to Duty Finder. If so, it will likely get worse as players dogpile on endgame activities, my money's on Crystal Tower breaking within hours of 2.1 release, while Titan HM suddenly seems to be fixed. Still this mantra of mocking the company who's providing you entertainment while still being around is getting kinda stale. If you're still playing, show a little respect is all.