I had this problem, too. I had joined a UQ, and soon after, other players weren't moving, and I couldn't damage anything. Logged completely out of the game, tried to get back on, but now Ship 2 says it's down for maintenance. wtf?

I've been getting 630'ed ever since the maintenance. I'm trying to get through the story, and I keep getting the error.

This is my PSO2 iteration of Naraei, my generic fantasy/D&D elf character: