What network connection are you using to get these notifications?
In general a mix of WiFi and telco cellular. In the example today, my house WiFi - a UniFi U6-Lite on channel 157 at around -65dBm when at my desk.
If it’s a telco, they might have modified their network and your coverage might have changed.
Telco coverage is really poor here - I have UniFi access points in 3 buildings that I roam between. I understand I may see some issues as my phone roams between the access points but that does not explain the example today where I was just sitting at my desk.
If it’s WiFi, your router or an antenna might have come loose, or a neighbour has updated their WiFi network and is drowning out yours
The antenna of a UniFi U6 Lite is internal - I have no way to check if it's come loose, but everything else works fine so I don't suspect it. I live in the middle of nowhere. My closest neighbours are about 100m away - I see one of them at -75dBm and the other at -89dBm.
Have you purchased and installed new equipment? It might be causing interference. An old piece of gear, a power supply, inverter, solar panel, could suddenly generate radio noise and stop things from working too.
Not that I'm aware of. I do sometimes see a hidden SSID broadcast from " SAGEMCOM BROADBAND SAS" hardware that I can't identify. I think it's my Bell GigaHub that has WiFi turned off - maybe it turns itself on from time to time to scan etc.
You might think of wireless communication as unchanging, but it’s constantly updating and reacting to local conditions which in turn can vary from second to second.
Yeah, I get that. I have other radio comms issues not related to Android, so not really appropriate here. I'm a volunteer firefighter and have a Motorola Minitor VI pager sitting on my desk. My pages often come through really scratchy, or not at all. We (the fire dept.) have just spent a few thousand dollars installing a new antenna at the transmitter and this has not helped.
Source: I’m a licensed radio amateur
I'd be very interested to chat with you privately about my pager issues :-)
Knowing that your 3a is still performing well enough promted me to double double check things.
I found that "Do Not Disturb" in the notifications settings is not just a simple on/off toggle but a sub menu. Under schedules in there I had "Flip to shh" on. In my example today it was sitting face up on my desk so should not have been in DND mode, but in general maybe being in my pocket is triggering this.
I've also cleared cache and data for Chat and Messages and they both prompted me to enable notifications when first run after that. (I'm sure I've already done this recently but can't hurt to do it again)
And, I've switched back to Pixel Launcher as a test. I much prefer Niagara and will switch back as soon as I notice and improvment, or determine that changing launcher has not improved anything.
Thanks.