Mumble crashing during blizzard games

[ngents]

Hello, I play World of Warcraft and Heroes of the Storm with my friends using mumble. It will work for an hour or so with no problems but will eventually crash in the background, I can hear people talking but can no longer talk myself and if I click onto the interface, mumble will crash and sometimes bring WoW down also.

I reinstalled my audio and USB drivers (I use a USB headset) and this problem has persisted through a reformat so I am not sure what to do from here.

I have this motherboard https://www.asus.com/us/Motherboards/Z97A/overview/[1]