If you haven't already, you have to delete/remove WiFi, not just disable/stop it. Network->Wifi->Remove
I've deleted but after few hours of mining I see the error message again:
usb 1-1: clear tt 1 (8030) error -71
usb 1-1: clear tt 1 (8030) error -71
usb 1-1: clear tt 1 (8030) error -71
Unload the wifi kernel modules.
log into ssh and rmmod the following:
ath9k
ath9k_common
ath9k_hw
ath
mac80211
cfg80211
then cd into /etc/modules.d
and comment out, or if you're confident enough, delete the following files in that directory, to prevent them from being loaded on reboot:
20-cfg80211
21-mac80211
26-ath
27-ath9k-common
28-ath9k