Usually this is a couple things:
1) Make sure the FTDI driver is installed on your radar pc
2) Make sure you disabled virtualization in your game PC Bios (some people don't need to do this, but found it helps reduce issues people have)
disable vt-d for intel
disable svm for amd
disable IOMMU/Virtualization
3) Make sure you have a good usb 3.0 cable and you're in a usb 3.0 port. Re-install usb/chipset drivers on your radar pc. Re-seat your cable, try different usb port, try different PCI Slot for the DMA Card, etc.
4) Set windows power plan to 'High Performance' on Radar PC.
All a bunch of things that can usually work through an issue like this, which is rare but can occur for some users
If none of this works I'd try checking in with whomever you purchased your firmware from.