I got a new motherboard and CPU recently, and now I got a few issues with mumble.
Headset plugged in with mumble connected = network connection goes down
Headset plugged in without mumble connected = everything fine
Headset unplugged with mumble connected = everything fine
I tried lotsa things, reinstalling audio drivers, motherboard drivers, reinstalling mumble, CCleaner... but I still haven't found a solution I guess I'll buy a new headset tomorrow that isn't usb... weird thing is, on my laptop mumble works fine with the same headset.
So I hope a new headset will fix it, but other than that I'm pretty much out of ideas
That sounds strange. Especially the part about it being related to the headset. You might want to try to switch off QoS in Mumble's advanced settings. Some broken network devices/drivers choke on it.