Constant connection issues during Frontlines

[KeyKanon]

And only Frontlines. I get the 90000 error, I almost never get this error outside of Frontlines, but once I enter Frontlines, it's happy to show up, often as soon as the match begins.

Time: All times of day
Frequency: Averages around two per Frontlines game, sometimes zero, but it was an instance of 6 in my last game that made me come here.
World name: Excalibur
Character name: Kanon Haruka

It was not always like this for me, only recently, I don't have the exact day it started, but I doubt it was any earlier than 2.38.
I find this to be a pretty serious issue, since it's putting the rightful victory of 23 other players in jeopardy if it happens at a key moment.

[Miki_Azatori]

Time: Any time I'm in an instance.
Frequency: Throughout instance.
World name: Masamune
Character name: Miki Azatori

I'm getting the same.
I tried two Frontlines matches just now and got kicked with either 90000 or 90002 within seconds of starting. Upon logging back in, I have at most 5 seconds before I dc again.
First instance I got it 4 times before we lost, and the second I got it 4 times before I was kicked from the pt.

Connection issues also apply to Ramuh Ex, where I would have long, frequent periods of the game freezing, then massive catch up (usually with me being dead).
Expert Roulette: No disconnections, but lag throughout dungeon, with waits between 2-3 seconds before combo abilities pop up.

-=-=-=-=-=-=- System Information -=-=-=-=-=-=-

SYSTEM_OS Windows 7 Home Premium 64-bit (6.1, Build 7600) (7600.win7_rtm.090713-1255)
SYSTEM_CPU Intel(R) Core(TM) i5 CPU 650 @ 3.20GHz (4 CPUs), ~3.2GHz
SYSTEM_CORE_NUM SYSTEM_CORE_LOGIC 4 SYSTEM_CORE_PHYSICS 2
SYSTEM_BIOS Award Modular BIOS v6.00PG
SYSTEM_LANGUAGE English (Regional Setting: English)
SYSTEM_MEMORY 3959.484MB
SYSTEM_VIRTUAL_MEMORY 2047.875MB
SYSTEM_PAGE_FILE 5083.430MB
SYSTEM_STORAGE C:\ SYSTEM_HARDDISK_DRIVE SYSTEM_TOTALDISC_SPACE 238.472GB SYSTEM_FREEDISC_SPACE 183.088GB
SYSTEM_STORAGE E:\ SYSTEM_HARDDISK_DRIVE SYSTEM_TOTALDISC_SPACE 1357.263GB SYSTEM_FREEDISC_SPACE 1166.580GB
SYSTEM_STORAGE M:\ SYSTEM_HARDDISK_DRIVE SYSTEM_TOTALDISC_SPACE 1863.015GB SYSTEM_FREEDISC_SPACE 981.647GB
SYSTEM_DIRECTX_VERSION DirectX 11
SYSTEM_GRAPHICS AMD Radeon HD 7800 Series
SYSTEM_GRAPHICS_DEVICE \\.\DISPLAY1
SYSTEM_GRAPHICS_CHIP AMD Radeon Graphics Processor (0x6819)
SYSTEM_GRAPHICS_MAKER Advanced Micro Devices, Inc.
SYSTEM_GRAPHICS_VRAM 2034.168 MB
SYSTEM_GRAPHICS_SHARED_VRAM 1723.742 MB
SYSTEM_GRAPHICS_DAC Internal DAC(400MHz)
SYSTEM_GRAPHICS_DISPLAY_MODE 1920 x 1080 (32 bit) (60Hz)
SYSTEM_GRAPHICS_DRIVER aticfx64.dll,aticfx64.dll,aticfx64.dll,aticfx32,aticfx32,aticfx32,atiumd64.dll,atidxx64.dll,atidxx64.dll,atiumdag,atidxx32,atidxx32,atiumdva,atiumd6a.cap,atitmm64.dll
SYSTEM_GRAPHICS_DRIVER_VERSION 8.17.0010.1315
SYSTEM_GRAPHICS_DRIVER_DATE 16/09/2014 09:31:42
SYSTEM_GRAPHICS_DRIVER_LANGUAGE English
3.0
SYSTEM_GRAPHICS_PIXEL_SHADER 3.0
SYSTEM_GRAPHICS_VERTEX_TEXTURE SYSTEM_SUPPORT
SYSTEM_SOUND Speakers (2- Plantronics GameCom 780)
SYSTEM_SOUND_DEVICE_ID {B7E6EC57-2111-4120-90AC-3665A3F72783}
SYSTEM_SOUND_DEVICE_NAME PLTGC.sys
SYSTEM_SOUND_DRIVER_VERSION 7.00.0008.2157
SYSTEM_SOUND_DRIVER_LANGUAGE English
SYSTEM_SOUND_DRIVER_DATE 05/11/2011 11:47:58
SYSTEM_SOUND 1 - S24B370 (AMD High Definition Audio Device)
SYSTEM_SOUND_DEVICE_ID {2AE3FFAD-F676-4ED5-8EDA-CC95A1C32071}
SYSTEM_SOUND_DEVICE_NAME AtihdW76.sys
SYSTEM_SOUND_DRIVER_VERSION 7.12.0000.7719
SYSTEM_SOUND_DRIVER_LANGUAGE English
SYSTEM_SOUND_DRIVER_DATE 22/06/2014 04:01:22
SYSTEM_SOUND Realtek Digital Output (Realtek High Definition Audio)
SYSTEM_SOUND_DEVICE_ID {E3FF3510-21C8-4181-9023-DB9058B5CB66}
SYSTEM_SOUND_DEVICE_NAME RTKVHD64.sys
SYSTEM_SOUND_DRIVER_VERSION 6.00.0001.6767
SYSTEM_SOUND_DRIVER_LANGUAGE English
SYSTEM_SOUND_DRIVER_DATE 30/10/2012 20:59:14
SYSTEM_INPUT {6F1D2B60-D5A0-11CF-BFC7444553540000}
SYSTEM_INPUT_NAME Mouse
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 3 SYSTEM_GAMEPAD_BUTTON 8 SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT {6F1D2B61-D5A0-11CF-BFC7444553540000}
SYSTEM_INPUT_NAME Keyboard
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 0 SYSTEM_GAMEPAD_BUTTON 128 SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT {4B10BA20-1218-11E4-8001444553540000}
SYSTEM_INPUT_NAME G700s Rechargeable Gaming Mouse
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 0 SYSTEM_GAMEPAD_BUTTON 767 SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT {4B10BA20-1218-11E4-8002444553540000}
SYSTEM_INPUT_NAME G700s Rechargeable Gaming Mouse
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 0 SYSTEM_GAMEPAD_BUTTON 0 SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT {4B10BA20-1218-11E4-8003444553540000}
SYSTEM_INPUT_NAME G700s Rechargeable Gaming Mouse
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 0 SYSTEM_GAMEPAD_BUTTON 0 SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT {4B10BA20-1218-11E4-8004444553540000}
SYSTEM_INPUT_NAME G510s Gaming Keyboard
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 0 SYSTEM_GAMEPAD_BUTTON 7 SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT {4B10BA20-1218-11E4-8005444553540000}
SYSTEM_INPUT_NAME G510s Gaming Keyboard
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 0 SYSTEM_GAMEPAD_BUTTON 0 SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT {4B10BA20-1218-11E4-8006444553540000}
SYSTEM_INPUT_NAME Plantronics GameCom 780
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 1 SYSTEM_GAMEPAD_BUTTON 5 SYSTEM_GAMEPAD_FOV 0