Checking out the router, noticed memory utilization at 46% instead of recent norm of 56-66%.
Noticed ACME, Caddy, Host Discovery Service, and Intrusion Detection were all "red" or "down".
I clicked "Run" on all of them and each started back up except for ACME, which remains down.
I may have to reboot.
Visiting the Services -> ACME Client -> Settings page and just clicking "Apply" without changing anything else restarted the service, and all are green at the moment.