Why my tricoputer stop ouput or while the error angle is to big

hello :slight_smile:
does anybody meet the problem when my tricopter flight angle is to big like pitch angle is more than about 30°
my flight will stop the output ,this make my flight fall-free and crash。 In uploaded picture above,out1.out1became output 0 in some time,anyone know the reason and how to solve it 。

hi,could you tell me how to connect pwm channel in px4 with esc.