Had something odd happen this evening. I tried to go to a website on my laptop and nothing happened. So I tried to connect to the firewall to see what's going on, and nothing happened. Looked at the device and for about a minute the blue disk light was pretty much continuously lit. During this period, some traffic did get in and out -- I had Slack messages hit the laptop, for example.
It finally ended, and everything was back. I went to Sophos Central and had an Alert that the firewall was back up. But strangely there was no message that anything had been wrong. No email telling me things are back up. (But I might be thinking of when the gateway goes down which gives both up and down Alerts and emails.)
I checked for Pattern updates: none in that timeframe. (ATP early in the morning, AV in the early afternoon.) I checked logs in SC and there are not entries from 16:29 through 16:30. (And strangely, not log firewall up, which I though was logged, but that again might be gateway up.)
Anyhow, just reporting it. XGS87 running v19 EAP. Recently I switched to having the XGS be the local DNS server, which moved memory usage from a pretty constant 74% or so, to about 80%. (Or at least that's how it seems to me.) For a little while, that gave me a yellow indicator, but since that initial blip it's indicated green, so I've been assuming it's more memory but still within acceptable boundaries.