OK fellow BF4 brethren, as a last resort I contacted EA customer service. I spoke to some great guys who were very willing to help and offered some new suggestions to try. I'm currently at work so I won't be able to try these until I get home but I wanted to share with you now.
Once I find the solution that works, I will edit this post so it only reflects the solution that resolves our issue. If you find a solution before I do, please post a response.
Note that the only things I've tried so far is the installing/uninstalling of the content and trying combinations of moving content from Internal to External drives (and vice versa).
Hope this helps! Instructions included below:
1. CLEAR THE MAC ADDRESS:
>Advise the player to go into the Alternate MAC Address section of their Xbox One by the path below:
>Advise the player to select the option: Settings -> Network Settings
>Advise the player to select the option: Advanced Settings
>Advise the player to select the option: Alternative Mac Address
>Advise the player to select the option: Clear
>Advise the player to shut down the console.
>Advise the player to disconnect the power cord from the back of the >Xbox One and wait two minutes.
>Once the two minutes have passed, advise the player to plug the >>power back in and wait for the power bricks light to go from White to Orange.
>Once the power brick has the Orange light advise the player to start the console and try the game again.
2. DELETE AND RE-DOWNLOAD THE GAMERTAG -- this suggestion made me nervous so they said I could also TRY CREATING NEW GAMERTAG AND THEN TEST DLC)
Note: (make sure that you must first remember the password to your microsoft account in order to go to this process)
>Scroll left on the Home >screen to open the guide.
>Select Settings.
>Select All Settings.
>Under Account, select >Remove accounts.
>Select the account that you want to remove.
>Select Remove to confirm.
>When you're finished, select Close.
>Go to Home screen.
>Press the Menu button on your controller.
>Select Settings.
>Note You can say “Xbox, go to settings” from any screen, but you’ll need a controller once you’re on the Settings screen.
>Scroll to the right. Under OTHER PEOPLE, select Remove accounts.
>Select the account that you want to remove, and then select Choose this person.
>Select Remove from this Xbox to confirm.
>When you’re finished, select Close.
>Just re-download the gamertag by going to profile and re-download the deleted gamertag or just simply go to the profile icon and add new and put your microsoft e-mail address and the password
3. CLEAR PERSISTENT STORAGE:
Step 1: Go to the home screen and choose settings
Step 2: Select Disk & Blu-Ray
Step 3: In the BLU-RAY section select "Persistent Storage"
Step 4: Select "Clear persistent storage"
4. POWERCYCLE THE XBOX:
Give these steps to the player in order to power cycle a Xbox One console:
While the console is on, press and hold the console’s Xbox button for 5 seconds.
The console will power down.
Unplug the power cord.
Wait 30 seconds.
Plug the power cord back in then turn the console back on by touching the Xbox button
Note: If your console is set to the Instant-On power state, the above steps will shut the console completely off and will not enable Instant-On or the ability to turn on your console by saying ‘Xbox On’ until it reboots.
5. CHANGE DNS (Domain Name System): (this one was provided in the email that was sent to me but there were no instructions, just a defintion -- he didn't mention this one on the phone so perhaps it's not necessary)
WHAT IS DNS:
Short for Domain Name System (or Service or Server), blah blah blah
