97klavabox

i recently have been having problems with my dna lavabox 200. the mod currently has 97,222 puffs, original battery. tested out the battery with my lipo voltmeter in which all 3 green leds light up indicating the lipo is good. the screen only comes on when the fire button is held down and right after letting go of it the screen turns off. ive checked all screen settings and ive tried to change them and still having this problem. please help -thanks