These are high quality custom PDBs made of 4 layers of 3oz copper, with silk screen, solder mask, conformal coating, electrical testing etc. They were designed to fit the FoxTech FH-H800 frame but could easily be fitted on other frames. Mounting h
After three unsuccessful attempts at finding a mechanical explanation to this problem I've decided to post here to see if anyone has encountered a similar problem and what they found to be the cause.