Battlefield 4 players on a number of platforms are currently suffering "intermittent connectivity problems," and developer EA DICE is aware of the problem, according to a banner atop the game's forums on Battlelog.
"We are continuing to monitor some intermittent connectivity issues affecting some players across various platforms. Thank you for your patience. We will update this with further information as available," the update reads.
It's unclear how widespread this problem is, but the connectivity issues are separate from the numerous problems with various versions of Battlefield 4 itself, as detailed in DICE's top issues tracker. The studio is currently investigating outstanding problems such as a "bug accounting for a large amount of crashes on [Xbox 360]," a "desynchronized game world" in which different players see different things, delays in damage received and sudden drops in frame rate. According to the issue tracker, DICE has already addressed a litany of other bugs, such as game mode ribbons being counted twice and non-functional filters in the server browser.
We're reaching out to publisher Electronic Arts about the connectivity issues and will update this article with any information we receive.