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    No Arduinos since the Arduino Serial have a real serial port. They all leave it to the USB-UART bridge (if any) to handle anything beyond RX and TX. Commented Jun 26, 2017 at 15:31
  • Strange, I (and many others) have never had such problems with the Leonardo not the other 32U4 based boards. Commented Jun 26, 2017 at 16:01
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    Your problems are likely caused by loading bad sketches. A more productive question would focus on the means of recovering from this, ie, identifying a reliable way reset the board and stay in the bootloader to erase the bad sketch. Commented Jun 26, 2017 at 17:46
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    @Cerin, I hear you. In linux, with an old Leonardo bootloader or third party bootloader, and a wrong sketch, and something called 'modemmanager' in linux, it is a real problem. In Windows and with a recent bootloader, it is working 100% okay. Do you have a programmer, and did you burn the bootloader with the Arduino IDE ? In linux, remove the 'modemmanager'. Yes, the sketch can be a problem when sending too much to the usb serial port. It could block something, preventing a restart of the bootloader. Commented Jun 26, 2017 at 19:29
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    A flawed sketch will not prevent reprogramming of an Uno; the same code on a Leonardo will prevent the logic that can intercept programming requests after the start of a user program from doing so. But it's still a badly written sketch. Commented Jun 26, 2017 at 20:29