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I am getting this particular warning after the servo write function after which the usb port gets diconnected and also shows me an error5003. This happens with the example file of arduino servo write too.
This Warning isn't important (assuming everything works). This warning is saying that the number of bytes at the serial port were equal to the number of bytes read. This is expected because before doing a read the driver will ask how many bytes are at the port, and then read that many. Ignore the warning if everything works.