Ring chimes are really flaky

I've got a ring doorbell and two ring chimes. The chimes regularly lose their connection and then don't ring when someone presses the doorbell. This happens to the extent that they haven't rung for any visitors to our house this week. I've tried resetting the chimes. One is close to the router and the other is close to an extender and both are showing good signal strength. I've contacted support without any joy. The person I spoke to seemed to think I couldn't connect the chimes, where the issue is the chimes don't stay connected.