Also happened to me, after patch at that too.

Time: Sept 7th
Frequency: Once
World name: Phoenix
Character name: Force Modified
NPC name: N/A
Monster name: N/A
Class/Level: 43 Conjurer / White Mage
Party or solo: Solo

I very much doubt this is people getting hacked unless they've had a database leek on there end, sounds to me like a nasty bug.
And i have a One-Time password on my account