Ask Samsung directly if a setting can help or if there's a firmware fix.
I just purchased a Bose Soundtouch 300 soundbar. I have it connected to the HDMI ARC port of my Samsung TV. Problem is every time I power on the TV/soundbar, the TV starts up on HDMI port 1 where my cable box is connected. After about 5-10 seconds, it switches automatically to HDMI4 (ARC). I have to manually then change the source back to HDMI1 to watch cable. This is extremely annoying.
Has anyone else experienced this and is there a solution to just have the TV stay on HDMI1 after power on?