I sometimes cannot hear anything like from behind me or from sides. Its game changing when enemy mccree or someone uses his ult and i dont hear it. My headphones are ok though.
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Yeah - this has been a bug for a good long while now 
https://us.forums.blizzard.com/en/overwatch/t/megathread-can-you-hear-the-audio-issues-i-bet-you-can/201295
I had the same issue after the recent windows 10 update, I reinstalled my audio driver and it fixed it.