Ada wrote If you cannot login webpage when the problem occurs, how did you view the log? 140903 is not the latest firmware... How about status of all lights in WDR4300? I was able to view router logs...

Region : Asia Model : Archer C7 Hardware Version : V1 Firmware Version : Archer C7_v1_140903 ISP : My Archer C7 v1 AC Router freezes or becomes inaccessible also no internet access within 5 minutes...