Ring works with chime or phone alert but not both!

We’ve just upgraded our home router. Since then our hardwired 1st generation Ring only works either to ring the internal mechanical chime OR to send rings and alerts to my phone but not both. Every time we reconnect the unit successfully to WiFi it works on my phone but the internal chime stops working, and vice versa. We have done several hard re-sets with no luck. It’s showing battery power on the app where it used to show hardwired and it used to work fine. Any advice?