Hello, The solution was found. the issue is on the cable between the router and the dlink (1 wire was not correctly plug). After fix the cable issue i have no error since 3 weeks. Problem solved !...

Model : TL-R600VPN Hardware Version : Firmware Version : 1.2.3 Build 140801 Rel.49374n ISP : SFR Hello, My router is behind a cable modem (192.168.10.x), the router manage a network with 20 clients...