mine says *2727*2878# for master reset

does it happens when you walk or stand still? if it is when you walk then you should replace the component that switch between Athena's and not the phone Athena's if it is when you are standing still then you should replace the phone Athena's

you should check your battery under a power supply with 3.7 volt be very careful about connecting the + and (-), use one cable on the + the second cable rest on the (-) leftover battery contact (on the board). if the battery work just fine then you should move up the battery contact and if that doesn't work then replace them

chack the connector\flat cable might have torn-up or either the lightning prossesor need to be replaced

you should clean the contacts and chack for corrosion, if there a corrosion then use a brush and alcohole too clean it if it is not working the you can either use jumper by locatin the short circuit or replace the board if not working crashing can be prevented by using factory reset here is a link http://www.youtube.com/watch?v=B43CTQ2Sy... or if it doesn't work you can use flash otherwise it is beck too hardware