Line Follower: can my code be optimized?

Projects Programming
7

If I try the following in my void loop() (battery power only, no usb whatsoever):

Motor(-120,120);
delay(1000);
Motor(0,0);
delay(1000);
Motor(120,-120);
delay(1000);

The board starts acting weird again, and does it's void setup() again and again because it seems to reset.
If I try Motor(120,120) for example, everything works like it should