Kore disturbing the radio

we encountered the problem to operate radio on the drone equipped by Kore board. Radio operates in very low C/N so the Kore in vicinity kills the link completely. We don’t see this issue when powering Orange Cube from USB but from battery only. I would blame the on board PSUs. Did anybody else experience same problem? Are there any solution for that? Is the Critical Notice “NEVER power radio devices off the Carrier board connectors” published in Doc related to that issue. Btw we have separate power supply for radio we have problem with.