Mass Effect 3 Multiplayer

@bluehydra88 

I have no experience with Xbox connection issues.

Here is a EA troubleshooting guide.

Did you tried to power cycle your Router and the Xbox?

@Arasteele 

1. One
   I can't say much to that. This problem can have many reasons, Origin, drivers, the serves in your region etcetera.
   it could help to clean the Origin cache:
   All settings in Origin (only in Origin not in the games) are back to default settings after this.)

• Close Origin completely.
  (right click on the Origin symbol in the task bar > close)
• Press the Windows key and "R" at the same time.
• Type or copy and paste "%ProgramData%/Origin" (without quotes) into the new window > hit ENTER
• Delete all the files and folders in the Origin folder, except for the "LocalContent" folder.
  (The "LocalContent" folder must remain untouched.)
• Press the Windows key and "R" at the same time.
• Type or copy and paste "%AppData%" (without quotes) into the new window > hit ENTER
• Now your Windows explorer should have brought you to your "C:\Users\>your user name<\AppData\Roaming" folder.
• Delete the "Origin"  folder inside the "Roaming" folder.
• In the address bar of your Windows explorer click on "AppData".
• Open the "Local" folder.
• Delete the "Origin"  folder inside the  "Local" folder.
• Restart your PC. > test
  
  2. Two:
  I normally prefer to give specific advise, but I can't in this case because this depends on your specific Router model.  
  You need to refer to your Router's manual for that.
  
  3.Three 
  Also hard to tell.
  Could be a Windows update, a update at your Antivirus software, an Origin problem, network drivers, even your new connection, (DS-light) a emerging problem at the Router, a Server problem or something completely different.      
  All you can do is to check the things you can influence.
  Power cycle the Router, Open the ports, check for new drivers, contact your ISP and describe the problem etcetera.