Hello all -
First of all, I'm sorry to hear you're having this issue! As suggested in the troubleshooting guide, we recommend checking to ensure that your console is up to date. In order to do so, with your console connected to Xbox LIVE, test your connection to LIVE. You can do so by navigating to the Settings hub, then select the System Tile. Select Network Settings, then select your network. After that, select - "Test Xbox LIVE Connection." That will prompt you for an update if necessary. :)
If this does not work, please check your cables. Are they securely fastened?
If that does not resolve the issue, then your sensor will need a repair. You should be able to set this up using our online service center, here: https://myservice.xbox.com/Pages/Welcome.aspx. If the sensor is less than 1 year old, then it will still be covered under warranty.
I hope this helps! :)