Arduino / Heteroduino

Hey there! I’m using Heteroduino to control 2 servo motors. I’m getting an issue with grasshopper hanging with Heteroduino after about 3 seconds of use. I’ve got an MD slider controlling the angles of 2 stepper motors and after initiating a few positions, grasshopper starts freezing up. It seems to be ok after I’ve unplugged the usb connection to the Arduino and back in again (but not always, it’s a bit inconsistent) - is anyone else having this issue / know how to fix? Would be awesome if I could have it working for up to 30 mins at a time or more, if possible! All latest drivers updated etc…