Don't know if it's an issue with CONTROL, Grbl or my xPro v4, but there's a few problems I've ran into a few times randomly. - My macbook pro starts complaining that the USB device (aka xPro) draws too much current and shuts off the usb. Happened once after 35 mins, once just when I plugged in. The mac has USB-C and I have to use an adapter to use the USB B-type cord - Mainly using the flattening wizard of CONTROL, the software and the machine are not synced. The software thinks the program is over even though the machine is still running. It keeps going with the correct stepover pattern, haven't tried how long... - The connection between the software & machine gets reset randomly. Latest happened when I switched the 0.1/1/10/100mm toggle, suddenly no movement from the XYZ buttons. It started to run a program, and after that the buttons worked again.