Has not happened for me before I started playing FF14 a few months ago, and since then happened 2 times including just now.

My internet disappears randomly every 3 (or so) minutes for about 15 seconds.
This makes it impossible to play any online game.
Last time this was fixed by my father resetting the router.

I am posting here to see if maybe someone else had this problem, and/or know the solution. Maybe this was caused by the game, maybe not.

Hoping to find a solution.