My daughter and

My daughter and I each have a eufy indoor cam for her toddler’s bedroom. I can see it on my phone using the app and vice versa when he’s staying at our house… They had been working well until suddenly she couldn’t hear me and then a couple of weeks later I couldn’t hear her. The cameras both work fine. We can each speak to each other through the cams, so it’s not a mic problem. We’ve tried factory reset, deleted the app and reinstalled, we’ve tried EVERYTHING! Any ideas people?