hello spyder19,
please refer to this topic for the port connections, Serial port 1 data loss occasionally - #5 by yzh03
you’re using Windows Operation System, right?
in my experience, Serial Port Utility just works with Windows7 and Windows10.
please also have a try by stopping and disabling the nvgetty service.
execute below commands on Nano to starts a console on ttyTHS1.
$ systemctl stop nvgetty
$ systemctl disable nvgetty