It should stay on whatever the last input is you were on when you shut it off
auto pragram the tv and store your channels ot should come back on a chanel no issue
Are you unplugging the tv?
is there anything hooked to AV1?
is it plugged into the wall?
or some box?
ok that makes sense there is signal on the line so it was seeing it and switching to it
so we have solved the issue and you know why it happened ...
Do you have any more questions?
please rate your experience and have a great day and ask any followup you need