Cannot play Battlefield2 multi-player for more then 10 mins

This is actually what I posted to EA's support section, but would like to expand it to you folks to get some help on this please. This has been a problem since the day I bought the game. As a side note, when I had my motherboard replaced, the Ethernet is on board, so I know it couldn't be bad as well... since I also play over 8 other games just fine in multi-player.

Here is my problem...

I have never been able to get Battlefield 2, Battlefield: Vietnam, and Battlefield: 1942 to work on my high-end Alienware machine in multi-player mode.
System Specs: Alienware AMD FX-55 CPU, AS8-SLI Motherboard using 1 geforce 6800 Ultra PCI Express (tried numerous drivers for my video card, I own 2 geforce 6800 Ultra cards and tried the second one as well in both PCI express slots), 1 SoundBlaster Audigy, 2 gigs of RAM, 160 gig hard drive, and Windows XP SP2 with all recent security patches.
I bought this game when it first came out and have never been able to get it to work at all in multiplayer mode. When I try to join a game, my system runs for about 10 seconds and then crashes and freezes up. The only option I have is to then cold boot my computer to gain control of it again. I still can hear music and sound effects in the background, but lose complete control over the game, forcing me to reboot.

I have tried every single patch released for this game up to the most current patch with no luck. I have updated my motherboard chipset drivers to the latest as we as legacy versions. I have uninstalled the game and reinstalled it at least 3 times. I even went as far as to format my computer and then reinstall the game again.
One suggestion a while ago was to turn off the EAX option, but that failed to solve the issue as well.

I sent my computer back to Alienware and had the motherboard, CPU and power supply replaced. I have also checked the knowledge base on the EA website about firewalls, and temporarily disabled everything that had to do with a firewall, still it does not work. I run anti-virus software on my computer and have 3 different programs to detect spyware. My system is 100% clean of all viruses and spyware, but still... this game will not run for more then 10 seconds in multiplayer mode without freezing my machine completely. When I play a single-player game of Battlefield 2, Battlefield: Vietnam, and Battlefield: 1942 against computer controlled bots, I do not get these lockups after playing for more then 30 minutes.
I have also checked all of my RAM in my Alienware system. With the help of a technical support agent, he had me download a program that checked to see if any of my ram is bad. I checked each stick 1 by 1 (only 1 stick was in the motherboard each time I checked it) for extended tests of 14 hours per stick of RAM. The test took about 4 1/2 days to complete. All 4 sticks of 512k RAM passed their test, and no errors of any kind were found.

I also checked for over-heating issues. I have the AlienICE fan system, which keeps my system very cool. When checking my BIOS’ motherboard and CPU temperature readings after playing World of Warcraft for more then 8 hours and DOOM3 for more then 5 hours… they were still very low. So I know this is not an over-heating issue.

I also have the same exact problem with multiplayer lockups when playing Battlefield: 1942 and Battlefield: Vietnam. I do not have the problem when playing my other multi-player games such as Everquest, Everquest 2, World of Warcraft, Half-Life 2, Counter Strike Source, Day of Defeat, Brothers in Arms, Doom 3, World War 2 Online, Planetside, Star Wars Galaxies, Quake 3, Call of Duty and Jedi Knight II: Jedi Outcast. If all of these games work for long periods of times without a single lock-up, that tells me there is an issue here with the Battlefield series that is a very serious issue indeed.

This leads me to believe that there is a network issue with the Battlefield series, which needs to be addressed. Is there some type of option that I am missing in an .ini file and could it be that simple? Perhaps some type of True or False Boolean value that I need to set in a setup file that could cause this? For months I have tried to find a solution, as you can tell from the different things I tried in this letter, and all that I ask is for a solution to my problem so that I can play this great series of games.
Thank you for any help that you can give me in this issue, and I hope after months of frustration, I can once and for all enjoy Battlefield 2, Battlefield: Vietnam, and Battlefield: 1942 on my Alienware computer in multiplayer games.

On a side note, with all the games I mentioned that work perfectly fine in multiplayer mode, except for 3 made by EA, what does that tell you about the quality of EA's development team? I have been playing PC games for well over 15 years, and I have never had this many issues with a series of games such as the Battlefield lineup.

Forgive me if I sound rude, but after having problems for more then 6 months... I am running out of ideas, and need to find a solution!
Thank you and I hope to hear some solutions soon *prays to be able to play at least one day soon*