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Zabbix
Real-time monitoring of IT components and services, such as networks, servers, VMs, applications and the cloud.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Can I recommend a simple thing like uptime kuma https://github.com/louislam/uptime-kuma I have it running in a Docker container on a LAN client. I have it ping/check local IP, switch IP, router LAN IP, router WAN IP, and my DNS servers. Easy to grok the failure point with that data. I've also set up Gotify so I get notified of any failures.
Since what I have is in essence an enterprise user network in miniature, I'm thinking enterprise software (like https://www.zabbix.com) is what's needed. It shouldn't be too hard to spin up as I've done many similar before. If this intermittent nonsense keeps up, I'll let y'all know how the troubleshooting goes.