So recently I've found out that my ECUTek Bluetooth Dongle is the cause of my Intelligent key range problems. Dynosty was able to replicate this problem on their cars, and with every dongle they had in stock. When I posted up this finding, it turned out I wasn't the only one,
in this thread, there were at least two others with this problem.
I'd like to see how many others are actually seeing this range reduction. Your phone does need to be paired to the device, at least that's what I found in my testing. Depending on environment conditions, I found range could be cut down to a few feet (literally) to sometimes still getting 15-25 feet (which is still very usable). However unplugging the dongle usually doubles this range.
I've reached out to ECUTek, who at the time had not heard of this issue. My initial suggestion is to just shutdown the dongle (at least the Bluetooth radio) when the car is off, via a firmware update. They are still looking into this at the moment to see if this is possible. Unfortunately complicating the matter their fobs are a different frequency, and cars RHD.