I had this problem using the USB lead connection and I was told to use the 9 pin serial lead which I did and haven't had the problem since. the machine is probably reverting to the default baud rate of 9600 which is ok for the serial and the parallel connections but not the USB which is 4800the blade isn't lifting between cuts and drags across the vinyl. Not had time to see if I can sort that. Shame really as it works a treat other then that! Would prefer to just get rid as per original thread, spares or repairs.