Re: no sound effects during multiplayer
I've had this issue many a time with battlefield 3 & 4.
The game was thrashing my hard drive and taking forever to load the audio files which I discovered using microsoft process monitor.
After installing the game on an SSD, whenever this has happened, it has only been for the first 3 to 4 seconds of a match.
I suppose this too could happen on a modern day console as I believe they also now have to install the game onto a hard drive.
I'm unfamiliar with what partition format or file structure consoles use, or if their disks are vulnerable to fragmentation so I can't speak for them.
A quick google reveals it is possible to "defrag" on a PS4 using the "rebuild database" option when in safe mode.
https://support.us.playstation.com/articles/en_US/KC_Article/Safe-Mode-PS4/
Then again this reddit thread explains it differently: https://www.reddit.com/r/PS4/comments/2bkfm7/what_does_the_function_of_rebuild_database_do_is/
Anyone with this issue on PS4 want to try that as a fix and let us know?