[help] tinywhoop low power issues...

So I have the stock fpv inductrix board with the e10 frame and crazepony insane motors my issue is I'm only getting about 30 second flight times it will punch out just fine at first and then just have no power at all I replaced the pigtail with the upgraded ph 2.0 and new battery's since I assumed that was the issue but now I'm having the exact same problems. Can anyone tel me why this is?