8 cameras suddenly started freezing up

Hello.

My setup is that I have two Indoor Camera 360s, a single outdoor camera, and five regular Indoor SEs.   My setup hadn't had any problems until two days ago when I started noticing them freeze up. At first it was one, here and there but now within an hour or two time they all have locked up.

Having many decades of IT experience I tried what I consider the first steps at troubleshooting.  I cycled the power, checked the firmware, even though they are all at different locations I even checked the voltage feeding to the cameras.   No luck.

I then proceeded to make the smart detection areas smaller on each device as well as adjusted it’s sensitivity.   I forgot to mention that every device is showing good signal strength.   I tested some other items on the network I created just for the cameras and left them running with cron jobs to regularly check network connectivity and there was no outage issues on the network.  

Nothing has been changed on said network since I added the cameras and I hadn't ran into anything like this in the six months plus that I have been running them.   They do not lockup if being actively viewed only when they are left alone.   I have tried a number of adjustments on each one’s sensitivity with no luck.

I put on a network sniffer via a Kali Linux setup and I am not seeing anything in the local network that would explain this.

It seems like maybe something is happening once the cameras connect to upload the captured video but I can not tell exactly what.

TLDR version:  8 total cameras, three different models, each is locking up upon attempts to send alert videos.  I have ruled out the local network, each have the latest firmware, each are in different levels locations, two of which have clear line of sight to the router.  Same results across all cameras.