Le Potato running in loop starting and stopping Serial Getty on ttys0

I am running Armbian 5.38 LePotato Debian Stretch next 4.14.14 and noticing some weird activities going on.
When checking the syslog it was full of this stuff:

.........
Feb 23 06:25:29 localhost systemd[1]: Stopped Serial Getty on ttyS0.
Feb 23 06:25:29 localhost systemd[1]: Started Serial Getty on ttyS0.
Feb 23 06:25:39 localhost systemd[1]: serial-getty@ttyS0.service: Service hold-o
ff time over, scheduling restart.
Feb 23 06:25:39 localhost systemd[1]: Stopped Serial Getty on ttyS0.
Feb 23 06:25:39 localhost systemd[1]: Started Serial Getty on ttyS0.
Feb 23 06:25:50 localhost systemd[1]: serial-getty@ttyS0.service: Service hold-o
ff time over, scheduling restart.
..........

and this goes on forever.... filling the syslog with megabytes of text.
What is going on and how to stop it?
As far as I know there is no gadget attached to ttys0, I only have a keyboard, a DVB-T USB stick, CAT-5 ethernet cable and HDMI attached to the LePotato.
The DVB-T stick is used as an ADSB receiver on Dump1090-mutability and fr24feed is used to upload decoded positions of airplanes to Flightradar24.com

Help?

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