Microsoft has sent a message to users on Xbox Live giving notice of scheduled downtime on Monday, reports Eurogamer.net.
The service will be taken down from 09:00 BST (UK) in order for maintenace to be performed, and will be up and running again at around 13:00.
Microsoft won't say what the maintenance is for, although signs point towards the annual autumn update. However, last year, the update was not applied until the end of October.
Unconfirmed reports hint the eventual Live update will include a parental timer, which will let you allocate and limit the amount of time selected users spend playing.