Time: Any day, any time I play Frontline (which can be from 19:00 up to 00:00 GMT).
Frequency: Once or twice per Frontline
World name: Balmung
Character name: Blaon Yagai
NPC name: N/A
Monster name: N/A
Class/level: WHM 50
Party or solo: Party, 8 people
Race: Lalafel male
In-game time: Doesn't matter
Area and coordinates: Frontline map. It usually happens during the first minutes
Steps:
Every time I play Frontline (PVP), I get 90k error once or twice per match. It usually happens during the first 3 or 4 minutes of the whole match.
Almost every time, I get the first disconnect 20 seconds before the first wave of drones spawn, which happens 1 minute after the gate opens.
I have a very stable connection, so it has nothing to do with it. Also, it doesn't just happen to me, so please stop removing 90K FL threads from the In-Game bugs section as if this problem didn't exist.
Also, this never happened to me before 2.4, but it happened to other people. After 2.4 hit, it happened to me, as well as to different people.

Connection Specs
Type of internet connection/provider: Jazztel
Modem maker/model number: AR-5387un Wireless ADSL2+ Router (Jazztel)
PC Specs
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Microsoft Windows 7 Home Premium
6.1.7601 Service Pack 1 Compilation 7601
Alienware Aurora-R4
X64 PC
Intel(R) Core(TM) i7-3960X CPU @ 3.30 GHz, 3301 Mhz, 6 main processors
RAM 16GB
Virtual memory 31'8GB
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Browser Information
Name and version of the browser currently in-use: Google Chrome 39.0.2171.71 m
Internet Explorer Version: 11.0.14