QGroundControl shows "Battery 1 disconnected. Land now!"

Hello everyone, does someone come across the problem that voltage drop during the fly and qgc shows “Battery 1 disconnected. Land now!” and the quadcopter crash!!After the crash, I check the battery connector, it is well connected. So, does someone has any idea about the issue? Thank you.
PS. I use mRo PixRacer Pro as my fly controller, and px4 1.13.3 as my firmware.

Arm the quadcopter and twist & shake the battery cable or motor wires somewhere near the power connector. I think you have a bad solder joint.

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Understand, thanks for your reply.