@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.
I do not work for Samsung or make Samsung Products but provide independent advice and valuable contributions.
My Device- S21 Ultra 5G ( SM-998B/DS ) CSC= BTU , 12GB/256GB One Ui 5.1,Android 13 .