To be more specific;
Im using the in-game replay and instant replay a lot; and some of these clips has sound but then suddenly new clips are all muted.
example: clip 1 and 2 has both my and game's audio, clip 2-3-4-* all silent.
only solution i found in internet was to select speakers on windows then re-select the headphones. it fixes for few more clips.
it looks like it started happening when i downloaded an original driver to my 7.1 surr. headphones. please help..