@wes012 It happened again for both connected pcs (a lenovo and hp, and a hp printer). While working, the ethernet connection just dropped. WiFi is fine. There are no VLANs (which sucks for security)...

Well, they connected after removing VLAN, which is disappointing, but it works. is there a way to configure VLANS?

@JDowns I am having the same issue with 2 HP using the Realteck GBE ethernet cards that worked fine minutes before on my older cisco router. it is not my ethernet adapters, your router is not...