Stylus a02 problems....

7130 pro i3 slim keyboard stylus a02

Once day the stylus did not work correctly (may be 2 weeks works OK !)

it disappears if you take stylus from the screen, after to return to screen

and then does not appear..... click, changed battery, stylus does not appear on screen !

help me

All drivers and bios is last ! Battery AAAA is new.