What causes a USB connection on connection #0 to drop after 5-10 seconds?   I am connecting a Nano loaded with the UNO firmware. This is a new ARC project with no skills or scripts in it.  The board is plugged into the USB port on the PC and the Nano.  The device manager sees the port as COM3 baud rate is 57600 ARC is also set the same.

If I connect to 1,2,3,4,5   It stays connected with no issues at all

Can you.tell me how I can fix the issue with 0 connection note all connection setting are the same but only location #0 drops connection.