Does your phone connect OK to other sources of Wi-Fi such as a coffee shop etc @Pio83 ?
There is a diagnostic tool in your Samsung Members App under the GetHelp button and diagnostic.
A Samsung Experience Store or Samsung Service Centre can take a look at your phone.
Daily Driver > Samsung Galaxy s²² Ultra 256Gb in Phantom Black.
The advice I offer is my own and does not represent Samsung’s position.
I'm here to help.
It may be worth sending an Error Report through to the Software Team if you believe an update started this issue, @Pio83. You can do this by recreating the issue (waiting for the Wi-Fi to drop out) and then heading to the Samsung Members app > Get help > Error Report > Ensure 'Send system log data' is ticked > Include a full description of the issue. The Team will then be able to take a look into what is happening within your phone and advise further. 🙂