Another issue you may come across with regards to WIFI and ~usbnetwork
Connect to Wifi, Enable ~usbnetwork, kindle drops to battery, turn back on.
Cant connect to wifi? stuck on 3G
Wifi component will say
Cant Connect if you try by hand.
simply cycling the ~usbnetwork on and off will fix this issue.
Caught me out a few times
Glad you got it fixed.