S20 fe 5g always have connectivity issues even standing outside house sometimes internet don't works well even after software update and diagnosis by samsung care executives.
Please reset network setting of both Sim one by one and than reset all settings of your's device in general management settings also Flight ✈️ mode on n off one time, restart your's device without any Sim in slots also interchange Sim in slots, turn off power saving mode then try to it's again. If you like please accept as a solution it's help to others users also,click on 3dots in my reply section and click on accept solution. Thanks.
As per your query, as you have already done the possible troubleshooting steps on your device, we would request you kindly visit the service center and inspect your device with the technical team end, they will provide you with all the information in a better way after inspecting the device physically.
