Disconnected with error code 90002, the party members changed after reconnected back.

Time: 03-14-2014 11:15 PM GMT+8 (Approx.)
Frequency: 1-time
World name: Asura
Character name: Killua Skyup
NPC name: NA
Monster name:NA
Class/Level: DRG/50
Party or solo: Party
In-game time: Can't Tell, please convert the "Time" above to in-game time.
Area and coordinates: The Navel (Extreme)
Steps:
1. Disconnected from the server with error 90002 during the fight
2. Click Start and wait for the "Connecting to Data Center" finishing
3. Click My Character's Name and Click "OK" to confirm Log in
4. Waiting the Loading Screen disappear, but it didn't. I can see the "Light Party" and "Full Party" message showed up but the loading screen was still there for about 2 mins.
5. Finally the loading screen disappeared, I was in a middle of the fight with some progression and I move my character immediately to dodge the attacks of Titan. When I looked at the party member UI, I found that the party members are completely different. They were CHANGED/REPLACED COMPLETELY. I'm sure I was in a different group.
6. The fight ended very soon coz all my (NEW)teammates were kill in a couple seconds.
7. The fight was reset. Waiting the loading screen again. It almost took forever to disappear. (approx. 2mins).
8. A msg "Motion to abandon duty passed. The party has been disbanded and the duty ended." shown on my chatbox. I was sent back to the open world. I was not in a party which I should because I premade a party with my fc mate to join the duty!

Connection Specs
- Type of internet connection/provider: 50M Broadband provided by PCCW, Hong Kong
- Modem maker/model number: Huawei, EchoLife HG863

PC Specs
-=-=-=-=- System Information -=-=-=-=-
Processor: Intel Core i5-3450
RAM: 16GM
HD: 2TB Harddrive, 126GB SSD
System: Windows 7 Ultimate 64bit
Display Card: GeForce GTX 670 with driver GeForce 335.23

Browser Information
- Name and version of the browser currently in-use: Google Chrome V 32.0.1700.107 m
- Internet Explorer Version: I don't use IE but it should be in the latest version because I will update windows whenever it's available.

ALMOST every time I got disconnected from an Instance, I will stuck at the loading screen when I reconnect back to the game. In addition, when there is a change scene (e.g. Instance reset or using short cut) which will lead you to a black screen/loading screen, you will stuck at black screen/loading screen for ridiculously long time again. Until you leave the instance, you are back to the normal. I believe I'm not the only one who is facing this issue because my friends have the same experience.

I can confirm the long loading screen after being disconnected during an instance and reconnecting to the game and still being in the same instance, it goes from 3~5 seconds to 60~90 seconds and just happens when i get disconnected (whatever the reason, server side or my ISP being a pain), it goes back to normal after i leave the instance.