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Solution:

• Run the miner as an administrator (or sudo rights if on linux)
• Re-upload the Arduino code to your board
• Re-burn the bootloader to your Arduino
• Select programmer as "Arduino as ISP" when uploading the code

Solution:

• Use a different USB cable
• If you are using many devices, try using a powered USB hub

Solution:

• Find folder named Duino-Coin AVR Miner 2.xx (for AVR Miner) or Duino-Coin PC Miner 2.xx (for PC Miner), in it you should find a file named Settings.cfg, open it with Notepad and find a line that says debug = n, change it to debug = y