100% FRESH build, win7 pro 64-bit, NVidia drivers downloaded directly from their site (NOT via Windows update/automatic install).
 
Bios: V2.02 & 8/29/2016 Chipset driver (most recent)
CPU: i7-6950X @ 4.2Ghz
Mobo: EVGA x99 FTW K
GPU: EVGA GTX 1080 FTW
Ram: GSkill F4-3200C14Q-GTZ
PSU: EVGA 1200P2
Case: EVGA DG-87
Cooler: Swiftech H320 X2 Prestige
 
Temps are fine, CPU is less than 45C while gaming, GPU temps remain below 68C while gaming with the core clock being in the 2000Mhz range.
The game runs smooth for about 5-10 minutes before I start getting insane packet loss & stuttering.
1.) https://puu.sh/rvzAy/1cb782f66f.png
2.) https://puu.sh/rvzCk/c8e4764086.png
3.) https://puu.sh/rvzJB/185278990b.png
The yellow spikes are the packet loss, the graph given by BF4's internal network graphing.
 
I've tried repairing the game, the game is a FRESH install on a secondary HDD (had it this way for previous build and it worked fine with NO packet loss or issues). I'm using the Intel NIC on this motherboard and it's updated to the most recent drivers. I've tried turning "Optimize Network" "on" and "off" within BF4 itself with no luck. At first I thought it was just one server but the issue carries over to other ones too, ruling that out.
 
3dmark11 score: http://www.3dmark.com/3dm11/11623739
Cinebench: (top 3 are me, scores differ due to having background programs open when doing the test) https://puu.sh/rvAMg/522312b9b2.png
^Obviously no performance issues there.
 
Don't really know what else to do considering this issue never happened before to me. Every driver is current, FPS is 110+ on ultra at 1440p before this happens, temps are extremely low, yet I get stuttering which causes FPS to dip between 40-70, GPU usage spikes and has a sharp decrease (99% to 30% to 50%, etc. etc.)
 
Thanks for help in advance!
Note: IT'S ONLY WITH BATTLEFIELD 4.
 
 
UPDATE:
1.) Issue happens after a few minutes both in Multiplayer & Singleplayer.
2.) Rolling back Nvidia drivers did not solve the issue.
3.) Updated Router firmware & made sure my Intel NIC was up to date. No change.
4.) G-sync enabled/disabled. No change.
5.) CPU OC/base clocks. No change.
6.) GPU OC/base clocks. No change.
7.) Repaired the game. No change.
8.) Temperatures are well within reasonable limits.
 
I'm at a loss here for what to do.

Haven't tried yet but the stuttering is directly related to the packet loss spikes.

I have a picture of the GPU usage. I'm thinking it may be due to the drivers...
https://puu.sh/rxxHh/a87dfcbb65.png
 
It plays fine for a bit then the usage drops and the stuttering occurs. Don't really know what else it could be. I ruled out the packet loss by playing with the chart open and it was smooth even during spikes. The VRAM of the card isn't an issue as this game only uses about 2.5GB on ultra out of the 8GB total.

Which NIC are you using and have you tried using the other one?  I'm assuming you're using the Killer.  I would download the latest Intel PRO NIC drivers from Intel's web page and try that.

UPDATE:
1.) Issue happens after a few minutes both in Multiplayer & Singleplayer.
2.) Rolling back Nvidia drivers did not solve the issue.
3.) Updated Router firmware & made sure my Intel NIC was up to date. No change.
4.) G-sync enabled/disabled. No change.
5.) CPU OC/base clocks. No change.
6.) GPU OC/base clocks. No change.
7.) Repaired the game. No change.
8.) Temperatures are well within reasonable limits.
 
I'm at a loss here for what to do.

I'm having the same issue as you. I have the 1080 FTW. Did you ever find a solution? I tried every solution I could think of.

I fixed it! Reinstalling windows from a fresh image seemed to have fixed it. I tried resetting windows from the settings but that didn't work at all. I think it was something to do with upgrading to creators update through windows instead of just doing a fresh install. Here's some of the things I tried:
-Reinstalling Nvidia drivers with DDU
-Turning fans to %100 for 50c Load temps
-Repairing windows
-Closing every program
-Unplugging second monitor
-Changing DNS/flushing
-Using Intel integrated GPU 
-Changing Power options
- Changing PCIe settings in bios
-Turning Windows page filing off /over allocating way too much
-forwarding ports
-Reinstalling BF4
-Reinstalling every windows program I could think of
-Disabling Xbox DVR and all other xbox settings
-Upgrading 8gb ram to 16gb (This did improve average fps a (Deleted Foul Language), didn't fix the stuttering though.)
-disabling sound drivers, usb devices, everything unnecessary...
-using custom network adapter settings
 
Everything I could think of off the top of my head. I've been trying to get rid of this for a week! So annoyed I didn't just reinstall windows from a new drive from the beginning. I guess I thought the windows recovery reset would be good enough, I'm never gonna make that mistake again.
 
One thing to note though, the packet loss indication didn't go away but the stuttering did.