Yep, use only direct usb on mb if can , NOT even those on brackets, case, …(sometimes quality of the wires are questionable)…
especially when flashing , calibrating. They are direct powered and since Cougar has already pretty long cable , there is certainly some Vdrop.
Also try disconnecting every unnecessary usb device, especially portable hdd drives, everything else then keyb/mouse if on usb, if not ps2.
Just to be sure and have best results when doing more sensitive stuff…, flashing, programming, calibrating, for normal use you can use and unpowered hubs,
if Cougar behaves normal then it is ok since we are not writing into stick , just reading its output.
Cheers