Comment 9 for bug 1719210

This appears to be a problem with either the kernel or the firmware for intel wifi/bluetooth chipsets. I've found that adding the following to /etc/modprobe.d/iwlwifi.conf and then rebooting seems to solve my problems:

options bt_coex_active=0

I've got no idea where this radio conflict is coming from as it was fine in earlier kernels :(