Open a support ticket. I am just a customer like you, so I don’t have any inside information. I don’t see anything in either the FAQ or Troubleshooting sections that address your situation. So opening a support ticket will be the best option.
When you create your support ticket request, include a link to this thread, so they will have the information you have already described. Also, let them know what camera version, camera fw, iPhone of Android app, App version, and model of phone and O/S version. They will be asking for that, so you can eliminate the delays if you provide that info up front.
Are all 8 phones being used from the same App/Phone? Are they all the same version and FW? All 8 bought at same time? More specifically, are the two that work at home different from the ones at work, or is the only difference the wifi/internet connection. Can you get one of the work cameras and try it at home to see if that makes it work differently?