also, try two things. first go to wifi settings and toggle hotspot on then off and see if that helps connect wifi. if not then try to turn off bluetooth and wifi then only turn on wifi on and see if that helps.
if default 0000 does not help then two choice. factory reset box or clear app data.
factory reset will reset everything on the box.
clear app data will delete everything on buzz app only. so shortest route is make a backup of buzztv app and clear data and restore.