We've started tolling out a new game update on PC. Servers are also updating to a new server version (R17) [battlelog.battlefield.com].

If the game udpate doesn't start automatically for you, you can trigger it by going into the Origin Client, right clicking Battlefield 4 and selecting "Check for updates". Patch notes below.

Dec 20 PC Game Update Notes
-Fix for terrain flickering when using SLI/CrossFire setup
-Fix for three of the top crash issues on the PC platform
-Fix for case when soldier can die with 1 HP instead of 0
-Fix for the issue where the revive UI could be permanently shown after accepting a revive


SERVER SIDE:
R17 Server Update Notes
-Fix for two server crashes
-Fix for a graphical bug that could occur when players accepted a revive within 1 second
-Server performance optimizations