HI @Trowsty Firstly restart your Device to see if that makes any difference. However you could enabling and disabling Flight Mode to reset the connections.
If that does not work Reset the Network connections by the following method:
Go to Settings-General Management-Reset-Reset Network settings. Additionally can reset All settings if continued problems.
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/256GBOne Ui 5.1,Android 13 .