F3 Evo Fried, Again?

Hey Everyone, I judt built my first racing drone (micro fpv). I am using the SPRACING F3 EVO, and I am on my second one now, each one has worked well for a short period of time, (10 flights?) and then randomly emits a curl of smoke, and dies completely. If I plug a battery in it smokes again right near where my battery wires are soldered to the board. If I connect to beta flight using USB everything works fine, but battery voltage reads 0 v even when plugged in. AM I doing something wrong? Is there a way to fix? I have surveyed the entire board with a microscope and found nothing as far as a visible bridge between two points.

Heres the receiver I'm using on UART 2: https://www.amazon.com/gp/product/B01M75FQIO/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1