This seems to be similar to the trouble I've been having with PLX Devices AFR-wideband. I have sent it back 3 times, and they still say nothing is wrong with it. I have discovered on my own that there is a short between the device and the gauge (likely within the device's female connection) that causes erratic reading and freezing. I can't believe they didn't find it. Just shows that once they got your money, you're on your own.