Over the course of 5 runs of Wanderer's Palace, my linkshell party disconnected 3 or 4 times from about 10:30 pacific time onwards. Interestingly, every time it happened the same 3 out of the 4 of us would be disconnected while the 4th never was.

Region, at least in obvious ways, can be eliminated as the cause, since I and one of the other disconnected are west coast NA, while the 3rd disconnected and the 4th who never disconnected are east coast NA.

The issue is also not limited to instances, since after we gave up on trying to play the disconnect lottery, I continued to disconnect while gathering in the open world.

Hopefully, this is just a symptom of the reason for the current maintenance and will be resolved when the game goes live again.