Constant game crashes on the same few of my characters after the last restart

See above. When I try to log on two of my low-level characters (lvl 45 barbarian and lvl 1 guardian), I experience a game app crash. This started after the last server restart. I log on my lvl 80 characters without troubles, though I had a game crash once on one of them.

Before the last restart, there was no such crashes.

@AndyB please take note of the possible issue.