Were you on modded server or vanilla server ?
There are many servers that have been struggling with this for a while. If any Funcom is listening then when it happens you get in the logs when you log in before you die that Character UUID could not be found. Then you play and play and play then you die, and everything on character components is lost when you die at that point.
Levels can be lost, attributes, data from Mod character components, etc etc.