extreme lag/error 90006 on only one character (Omega, Chaos DC)

in the two weeks i've been pretty much unable to play on my second character because of error 90006/incredible lag. both my characters are on Omega, Chaos DC, but while i can play with absolutely NO lag with one, the other experiences continuous errors and what i can only imagine is lag due to data loss.
since it's affecting only one my characters i'm assuming this is a problem on SE's end, but i'm at a loss on what to do

Are you using a wired or wireless connection?
i use a fiber connection

Do you have any firewalls or anti-virus software installed on the machine if are using a Mac or Windows PC? If so, which ones do you have installed?
no, nothing

Internet Service Provider
Vodafone

Location/Region you are in (Not in game, your actual location)
emilia-romagna, italy

Does any specific error message/code occur when the issue happens?
error 90006

Does the issue only happen with one specific character or a certain time frame? Please clarify.
yes, it only happens on one of my characters (Caelemis Qerel), but there's no time frame

winMRT of Varere Rere (my character who has NO lag problems): https://justpaste.me/4f8b
winMRT of Caelemis Qerel (the one who's affected by error 90006): https://justpaste.me/4f9q

bumping as i'm still experiencing this error every time i log in