Okay thanks. I knew the notifications thing had happened before and I thought I remembered Chao saying it was sorted, but apparently I misunderstood. A warning would be awesome, and yes it was Android notifications. I really should set up Telegram and give that a go.
As far as blackouts go, this is happening on POE Lorex Cameras that had been working fine up until yesterday. The Wyze cams have also had some significant dropouts, but I really have no complaints about a $20 wifi camera being cranky. I'm used to them going on and offline at a whim, that has always been the case with those.
The only other oddity there was last night when I checked on things, I had a Wyze cam that I could view live no problem, but had a large black spot in the timeline that ran all the way up to the live view I was watching. I zoomed the timeline down to 3 minutes and left it open for a while, and it still didn't fill any of the timeline with recorded footage despite watching the camera live (the Wyze timestamp was updating so I know it wasn't frozen). Refreshing the page also left a black timeline during the period that I was actively watching the live stream from that Wyze camera.
I did reboot the system yesterday (UI remote reboot) and the dropouts persist. I'll get out to the site tomorrow to see if I can find anything on the network health. Upon closer inspection while writing this post they seem to be tied to a particular switch, though all cameras on that switch aren't going out at the same time, and the dropouts are mostly confined to one camera.
Looks like I have some hardware debugging to do, I'll probably just replace that switch as a first level diagnostic. I added the dropouts to my post in case anyone else was having an issue, because it seemed correlated with yesterday's update since it's otherwise behaved itself this past month.