Samsung UN46ES7500F E-Manual page 479

Your settings are lost after 30 minutes or every
time the TV is turned off.
If the TV is in the
reset audio and picture settings every 30
minutes. Change the settings from
Demo
Setup
using your remote, and go to
Setup.
You have intermittent loss of audio or video.
Check the cable connections and reconnect
them.
Loss of audio or video can be caused by using
mode to Home Use
procedure. Select
Store Demo
mode using the
TV
mode, it will
Store
in the Source
System
→