Serial connection terminating when connecting 12v power

[Larsvest]

Nano clone problem. Read the whole thread, and see solution

Arduino COM port issue

Hello, I am setting up the whole system for autosteering and the problem I find is that I upload the sketch to the arduino nano without problems through the COM21, when placing the arduino in the V2 pcb, feed it with 12V and reconnect the arduino to the notebook windows tells me that it is an unknown device, if I connect the arduino without it being on the autosteering board I can connect it to the agopengps software without problems and there is communication between the two since windows keeps…