I’ve just bought a load of minis for TTS and for the first few days they’ve worked great , no delays and perfect.
Today they’ve all become unresponsive and the only way to get them working again is going into the device and clicking initialise.
Is this due to an IP change? If I go into my router and set up reservations for each of them will that fix the issue or is this a common issue and TTS on Google homes/minis?
This is a known issue.
See if the app listed below will help keep them alive. I've got 7 or 8 homes, minis & hubs and this is what I use.