We're patching our servers to fix long hitches that caused simultaneous interrupted connections for all players in a match.
This will roll out over the next few hours.
Just to clarify: this update is totally invisible and will not affect any games in progress. The patch goes out to a new set of servers, and new matches will get the new server version. Matches running on the previous version will be unaffected, and we don't deprecate the old server version until there are no games left running on it.