If you have apartments nearby then it is possible that the WiFi channel you are using is congested. Most users leave their routers set to the default channel. Changing channels is usually very simple after accessing your router’s user interface.
Accessing the router’s interface is usually done by entering 192.168.1.1 or 192.168.2.1 into a browser address bar and logging in with password “admin”. Your ISP may have supplied different login information.
Once logged in you will find options to change your 2.4 GHz channel (the Experia 10 manual may help). Try a number of different channels and see if that makes a difference.
The Experia 10 has dual band WiFi meaning you could also try shifting your iPad to the 5 GHz band and seeing if that helps. The 5 GHz carries more data but can have a shorter range. The default SSID and WPA2 key are usually printed on a label under the router. Also check your ISP materials for any changed default. It’s always a good idea to change your WPA2 key to avoid strangers leaching off your WiFi. Don’t use an easy phrase here, generate a big random string and keep written and computer records of your new key in various locations.
Lastly, if changing channels or bands doesn’t improve things you might consider a WiFi amplifier or mesh. An amplifier just receives and retransmits and you can adapt any old router lying around to do this (Google or the router manual usually has instructions).
There are also various mesh products that will overlay your usual WiFi network. Roon users, including Danny, have found the Eero mesh to work very well: