Hi Marley,
Thank you for your response. Actually my husband who is a shared user started to have the same problems with the same cameras last night. In addition, the doorbell camera decided to stop altogether, when we had no problem with this one before, not even with the previews… So I decided to do something different, since it had become a camera problem, rather than a phone problem. I shut the electricity off completely in my house for 5 minutes, not just the camera breakers, to see if it would refresh the system. And it did… All the cameras are back online and the previews are refreshing every minute on all of them. However, I still cannot download a snapshot from a recording. It still fails. So I have to figure that one out. But at least, everything is back online, recording and previewing as it should, which is the most important.