Power Outage & No App Ability

I know this has been touched upon by others (I believe, but I could be wrong). On NYE, we had a city/neighborhood power outage. My router and modem went down (I have a UPS for the two, but I realized the battery needs replacement – the new one should arrive today). I heard the audible alert from the Base telling me the system was using battery backup. I received texts stating there was a Power Outage and my home was still protected (backup battery in use). I also received a text letting me know the outage disconnected the Wi-Fi.

Here is the issue:

When I went to check the Base Station, the blue light was off. That could be normal, but I realized that in over eleven years of utilizing SimpliSafe, I have never noticed the light being off when armed. I went into the app to disarm and rearm it to ensure the system was working correctly in cellular mode, but it would not work. I tried three more times with the same result. I then went to my Keypad and disarmed and rearmed the system. Although that worked, an unusual lag and a message claimed my living room entry sensor was open (which was incorrect). If I remember correctly, that message was from 2-3 days prior (via the Keypad) but had never appeared before. I refreshed my system that day, so seeing the Base thought an entry sensor was open was odd.

I have noticed that I must be connected to Wi-Fi (on my phone or tablet) for the system to accept any changes. It does not have to be my network (sometimes I am away with family and friends or at a hotel), but it must be connected to Wi-Fi to make changes. I will read the forum, but this should not happen, correct? I am uncertain if the alarm would have gone off had I tested it. I will troubleshoot this week to see if I can replicate the problem and return with my findings. Something is wrong if I must be on a Wi-Fi network to utilize the app.

Happy New Year everyone.

Edit/Update:

Okay. So, I tested it on cellular only (not Wi-Fi), and I could make changes without issues. I will disconnect my router (and modem to replicate) later today when the new battery for my UPS comes in to see if that makes a difference. I do not understand why I could not make changes that NYE morning. I had full cellular coverage. Perhaps it was too big an outage, and there was more at play? But it is not the first time it has happened (which is why I always turn Wi-Fi on before going into the app – even when not at home). This morning, it would not load any devices (so I could make changes) until I turned my phone's Wi-Fi on.

It is something I need to investigate for sure.