Xbox users playing Xbox 360 games should take note of incoming Xbox 360 server maintenance that may cause disconnections from Xbox Live. Naturally, the maintenance will also affect backward compatible games being played from an Xbox One.
The official announcement is as follows:
On Tuesday, February 19 between 2:00PM UTC and 6:00PM UTC (9:00AM ET and 1:00PM ET), we will be performing scheduled maintenance that will affect Xbox 360 titles and services.Services should return to normal following the maintenance's conclusion.
Please note this maintenance will also impact Xbox 360 backward compatible titles on Xbox One
All other Xbox One titles and services will not be affected.
If you’re playing an Xbox 360 title during the maintenance, you may be disconnected from Xbox Live one or more times.