I bought an Arduino Micro and connected it to my computer. First I loaded the "Blink"-Program and it worked. Then I tried to load my own program and the Arduino wasn't detected by the computer anymore. The TX-LED and the blue ON-LED on the bottom side are lighting. When I press the Reset-button 2 times it is detected again (green LED is on) but after 5 seconds the green LED is off, it isn't detected by the computer anymore and the TX-LED is lighting again.
First I thought the board is defect so I sent it back an got a new one. When I tried to program the new board it was the same again.
I also tried another usb cable and another computer without success.
I already programmed an Arduino One with the same computer some time ago and it worked without any problems.
Is this there a software / hardware problem with the Arduino Micro or did i do anything wrong?
Operating System: Windows 10, 64 bit
Arduino software version 1.8.1.
Serial number: MHB17F003865