Arduino Mega 2560 Won't Disconnects from USB port

Development Tools IDE 1.x
1

Hello,

I'm trying to run a program that requires my Arduino to be constantly connected to the serial port on my computer, but whenever I run it the program will work for a couple of seconds to a minute, and then stop. When it stops working I get this error:

the selected serial port avrdude: stk500_send(): failed to send command to serial port
 does not exist or your board is not connected

and then I have to reselect the Arduino's port the tools section.

Is there any way to keep my Arduino Mega 2560 continuously connected to my computer's USB port?

Thanks.

2

Yes there is but just in case it is your sketch you should add that please.
Dont forget to use code tags ( </> )

You also need to mention more about your project.