Internet connection drops entirely while trying to play Battlefield 4

This issue relates to the video game Battlefield 4 on the Xbox 360, PC and Xbox One

Since December 20th, I have experienced the most unusual connection issue. Every couple of days (sometimes 2-3 days in a row), my Internet connection drops entirely while trying to play Battlefield 4. It started happening after midnight up until roughly 6 AM and was fine after that but the problem soon began to occur at all hours of the day.

A brief summary of what happens when the issue arises: Sudden noticeable and then heavy lag causes me to be disconnected from the game server (including EA's online service) and Xbox LIVE, at which point the Internet for my home drops altogether (total connection loss for all devices in the home). I have to wait 1/2 minutes for it to recover and reconnect. This issue relates to Battlefield 4 only - and I'm sure of this as I can play any other game (including Battlefield 3) online without any problems after my Internet disconnects due to Battlefield 4. So again, the issue arises with this game and this game only.

I thought it was isolated to the Xbox 360 but the same happens when I'm trying to play on PC. On top of that, a friend of mine purchased an Xbox One and the same is happening to him on that platform (he also gets booted offline on Xbox 360). The thing is, he resides in the United States whereas I do not, so this is obviously not just a Virgin Media-related issue. A group of my friends in the US (different ISPs to each other) suffer from this issue along with me.

We contacted Microsoft but they told us to talk to the publisher (EA), who had me run a bunch of tests and open ports, etc which did not help (if port forwarding was the issue, we wouldn't be able to play at all). I even went as far as getting in touch with the game developer (DICE, owned by EA) and the "go to" guy for such problems at the company said he had no idea what was causing this and therefore could not help. We have no where left to turn and so I hope somebody here can help.

I've attempted numerous things in the hopes of reaching a solution, all of which have failed. They include (but are not limited to):

• Turning UPnP off

• Assigning the console's IP to the DMZ

• Port-forwarding (required when UPnP is disabled)

• Changing MTU from 1500 to 1492/and lower

• Connecting to Xbox LIVE by connecting the console directly to modem

• Disabling the router's firewall and IP flood/port scan detection (known to cause problems)

• Enabling IPSec Passthrough

I'm sure I'm missing one or two more things I've tried here but rest assured, I've exhausted everything that I could think of. As stated previously, this happens to my friends in the USA, too. If we're playing together when the issue occurs, we all get kicked off one after the other. I know it is not strictly related to my ISP, but if anyone has any idea why this is happening or at least has something else for me to try, please let me know.

As of the past 2 weeks or so, I'm no longer getting kicked offline when trying to play on PC but the issue persists on Xbox 360. To add to this, a friend of mine moved house and got a new ISP but still suffers. My plan is to install a 2nd network card into my PC and connect my console to it, then bridge that connection to my PC's primary network adapter and try to play that way and hope to get kicked while Wireshark is capturing on the console's network adapter in order to see what happens before/during/after the disconnect. However, I'm thinking that seeing as I can play fine on PC now, playing on console through my PC's NIC may allow me to stay online without problems. This connection method (dual NICs) is not ideal for my friends, however.

Any ideas?

Thanks in advance.