fwiw, at the most recent "login server" crash, the following happened to me:
just before login server died: level 34 explore, 90% explore XP to the next level.
i was still in game, so i figured i would warp around to a few asteroids and top off to level 35.
i just barely reach level 35, then i get kicked off (presumably things were restarted)
i log back in, to find myself at level 35 explore, with 98% explore towards the next level. in other words, the game gave me a whole free level. the only way this makes sense is if the "XP to next level" had been saved to the database separately from my actual level, so the two got out of sync on the server reboot.
expected behavior: my character should be somewhere between level ~34.9 to 35 on login, not at level ~35.98.
i dont know if this is enough information to do any useful debugging with, but i figured it would be worth a note.