vanasupa

Hi. I suspect that I have a similar problem as being described here. I don't know if you can confirm or diagnose it as something else. I am using the AD2 in SCOPE mode, Channel 2, using a BNC interface. I am connecting to the AC output of an educational, 2-pole motor (turned manually by a crank) using male-banana clips to female-BNC cable. I am connecting the AD2 to a MAC using a non-powered USB to USB-c adapter. I am simply trying to monitor the output of the motor. The scope displays the output. However, when I turn the crank at a high frequency (output probably ~2 V), I get a crash notice (attached). I've repeated this about 7 times to report that it is a consistent behavior. Have you suggestions on what I can do to prevent this crashing behavior?