Weird Tiny Freezes

Hello, I'm having very tiny hard freezes, as in "did my computer just crash!?" kind of freeze. A bit of background, I run an open Guild Missions event, we are about 15 to 20 people, and whenever I get one of these tiny freezes, people from other parts of the world who are doing missions with me are having the exact same issue at the exact same time while we are on a map. It was on Monday, about 11 am pacific, at Bear Lope Guild Rush in Lornar's Pass; people from Germany, USA (Alaska) and Argentina reported problems at the same time. Even asking in map chat and people reported this weird thing.

It doesn't happen all the time, it doesn't happen everywhere, but when it does, it affects half of the map.

For the first time playing GW2 I also had short freezes (split seconds) while playing yesterday. Just for me, it was in the Clock Tower jumping puzzle, which I ran literally hundreds of times before in previous events and never had those. Made me fall down and fail multiple times :/