Did u solve it yet? It sounds like your board is either losing power or you need to upload new firmware.
Check the following:
-ATMEGA processor removed (for serial terminal use)
-capacitor (about 220 uF) soldered on as in the tutorial.
-If you want to use a serial terminal, set both your serial com jumpers (next to the capacitor above) to USB. Otherwise set them to ARD.
-If you’re powering your board through the arduino, set the power jumpers on the shield to 5V. You probably need to plug an adaptor into your arduino as well. In the tutorial they suggest 12V which is a bit overkill - I’d use something smaller.
If it’s still not working, you might want to try uploading new firmware. It’s quite simple and well described in the tutorial.