Browser_Mod Unavailable on One Tablet

I have three Lenovo M8 Tablets all hooked into Browser_Mod. One of the tablets, however, is always unavailable. It’s in an always on state so it’s not asleep or anything. I also uninstalled Browser_Mod integration and reinstalled that one tablet as the only device and although it displays it on HA, it still shows as unavailable for status. Any ideas why this one of three of the same tablets is not connecting?