Pretty sure most don’t connect to (home) WiFi. It’s all done via the sun card and the connection from your meters. If you haven’t already, try moving the display unit closer to see if it re-establishes a connection?
If from the meter itself, check nothings fit in the way/anything has changed. Sometimes it can just be the network provider changing something which is annoying. If you know what network the sim uses then could always do a coverage checker.
Pretty sure most don’t connect to (home) WiFi. It’s all done via the sun card and the connection from your meters. If you haven’t already, try moving the display unit closer to see if it re-establishes a connection?
If from the meter itself, check nothings fit in the way/anything has changed. Sometimes it can just be the network provider changing something which is annoying. If you know what network the sim uses then could always do a coverage checker.