I don't know if I've added this post to the correct board.
At home we have our WiFi router and a repeater to boost the signal in the back of the house. When my Galaxy S20 connects to one it stays connected even when signal is very weak, leading to buffering, instead of connecting to the strongest available network when moving between rooms.
Could the product development department add to a future software update the ability for the phone to connect to the strongest unlocked WiFi network please?
I have exactly the same issue with my S21 Ultra. If I'm not mistaken Android used to have native settings that allowed for this. I am also eagerly awaiting an update that will solve what must be a common problem.
I'm experiencing an issue on my S20 FE which may be related to yours. I can only see the lower speed 2Ghz networks including my neighbours but cant see the 5 Ghz one.2Ghz networks generally have a stronger signal and range so it looks like only networks with strong signals are being seen by my device.