DICE community head Zh1nt0 announced via Battlelog-Battlefield 3 that the game's Xbox 360 and PS3 servers will experience a short downtime tomorrow to improve "server stability."
The downtime will take place from 9 a.m. UTC to 10 a.m. UTC, or 3 a.m. CST to 4 a.m. CST. During that hour, players will be unable to connent to multiplayer matches. According to DICE, the server improvements will not affect PC players.
We´re very sorry for the invoncenvience but we´re confident this is needed and will be awesome for you and those involved. Keep fragging!
Source: [Battlelog-Battlefield 3]