I have been seeing periodic drops in internet access from LAN connected devices lately (last 2 months), and I haven't been able to figure about exactly what is going on. There doesn't seem to be a pattern, and it resolves itself after a few hours.

• I can access the internet from my router
• All devices on LAN can reach each other, both wired and WiFi
• All devices on LAN can reach router, both wired and WiFi
• I haven't changed anything in router settings
• I haven't added new devices to my local network
• I can't find any IP conflicts
• It's a simple flat network with two APs, a single switch, no VLAN separation