Hi mirocha,
"Read Failed - Auto Disconnect" occurs when the PC can't communicate to KFLOP. There are basically 2 causes for this. Either noise on the USB to the PC causes it to disconnect the connection. Or KFLOP resets/reboots for some reason. You can determine which is occurring by checking if KFLOP still has your configuration afterward or the default configuration. Or you might turn off one of KFLOP's LEDs. If the LED comes back on you know KFLOP rebooted. What Rev of KFLOP do you have? Rev 1.2 and before had some sensitivity to noise being picked up on the Reset inputs.