Arduino Drops after 12v applied

[Larsvest]

Arduino COM port issue

Problem solved, the issue is the clone Arduino itself, as the article I read says the chinese are so good to copy the boards that they copyied the bugs too, here the link to the page, hope to help, thanks a lot buddies for your help. https://ketturi.kapsi.fi/2014/04/how-to-fix-moody-arduino-nano/

Now you can check if your nano is like that.