[MW3] Connection issues.

I’ve been having connection issues with call of duty online since yesterday afternoon. I was able to play online with no issue prior to yesterday & haven’t had any success getting online. I was able to get in a game of war zone and it lagged me out. Any reason why I can’t connect ? All of my other apps on Xbox work fine, even had issues connecting to other games on my console. Not sure what to do, any suggestions?