Watching a channel but sound from another channel?

[Vinny74]

I’m watching bbc1. But the sound is from channel &when I choose another channel (say 35) it still has the sound from channel 5? 
any help!!! 

[JAMES4578]

@Vinny74  Ensure you have the latest firmware, if not can be downloaded to USB and upated that way. https://www.samsung.com/uk/tvs/  However you may need to reboot the TV and any external devices you are using.  unplug for at least a minute before trying again.  If that does not work try a Factory Reset.

[Spencer bloke]

My Samsung TV has just done this too, I did a full reset to remedy it. 
however it’s very disconcerting as it’s only been set up two days. Hopefully it’s now sorted because resetting isn’t a fix that’s acceptable if it happens again. Bottom line things have hiccups however it shouldn’t happen at all on a TV of this price. 

[Lunch]

Same thing here on a new Samsung TV. Only thing that works is to factory reset and reenter all passwords and preferences. Very annoying and I can't find a solution anywhere.

[Lunch]

Have had this TV for 6 months, happens about once a week.  Very annoying that there isn't a fix for it

[Lunch]

I chatted with Samsung. They suggested unplugging the TV from the wall or power strip for at least 1 minute to reset the 'glitch'. It's annoying but less than a whole reset.  It has happened twice since and it has worked each time.

[PaulTelly]

Worked for us, thanks very much. Let's hope it continues to work. 

[snara]

This is very annoying, as when it happens I have to make sure I am not crazy!  Unplugging from the wall seems to re-set it for awhile but the issue comes back.  Luckily I do not watch much local TV and mostly stream where this is not an issue.