Sound bug.
Use one gun with silencer and you silence the whole server. I kid you not.
http://bf4central.com/2013/11/ridiculous-battlefield-4-gun-bug-mutes-entire-server
One that made it from the Alpha to the Beta was if shot dead while on a parachute, when revived you couldn't move except sideways! Been waiting for the right circumstances to test if this one is still active.
Seen any other crazy bugs? Post 'em here!
Yup I've had looooads of sound problems. That and weird lag are my main two complaints so far. When I can actually get into a game, that is. Most of my time is spent staring at the joining server screen.
From the bug update page.
Miscellaneous Audio Bugs
FIX UPCOMING
We are aware of the issues with missing/corrupted audio in multiplayer and have created a fix for them. This fix is planned for release in the next PC client patch.
Think I have it on one map mostly. The name of the map eludes me at the moment.