90002, 90006 errors

[KGN]

Having the same problem for a year already, for me 90002 happens always in POTD when I'm playing Solo and some days it happens twice or thrice within a short period of time. I started first playing on NA and then moved to JP but it made no difference, this week I moved to EU that's suppsoed to be the best from my location and although I get no lag of any kind, I still get these 90002 errors, they actually occur more often than when I was on JP or NA. Often it happens as soon as I enter a new floor in POTD. I tried at any time of the day, at night too I assumed it would be the best time to avoid connection issues since the servers would be underpopulated but it makes no difference. There are no lag lagspikes or any kind of visible signs prior to the 90002 errors, it's like the server kicks me out instantly.

Today though I noticed something new, right after I entered the passage and moved to the next floor, my character was inside a non-entrance room. The entrance room of each floor is always a large area without pillars or obstacles, this time it was a random cave with central rock column like those you see everywhere between floors 21 and 30 (I think I was entering floor 24 iirc). It disconnected me with 90002 as soon as the game loaded the new floor with the abnormal entrance room. I've already wrote a long report out of frustration to the support center but after a day I received no reply. Consider this happened to me when I was on floor 115th once... and I had started from floor 1 not 51, I almost canceled my sub in rage. I would probably lose my mind if a 90002 happened on 199.

My connection is 4G but it's the best ISP of my country and the speed is 10/5 which should be more than enough for any MMO. I never get any lag.