Serial Number : NKS16121052 Firmware Version : v4.2.3.07 (Oct 8 2015 15:29:55) PID VID : RV042G V01 Firmware MD5 Checksum : 4da89c6668332536d982a2ec5dd6b646 LAN Working Mode : Gateway IPv4/ Subnet mask : 192.168.1.1/255.255.255.0 IPv6/ Prefix : --- / --- System Up Time : 201 Days 6 Hours 5 Minutes 35 Seconds (Now : Fri Sep 30 2016 20:14:13)
Every 3 to 4 days Internet speed goes way down. When browsing in chrome you can see the message "Resolving Host" at the status bar. I can fix the problem by setting IP mode to IPv4 only. This will work for a few days and then the issue returns. Again I can fix the problem by setting IP mode to dual stack.
And back and forth the issue returns after few days and I have to select a different IP mode to resolve the issues.
By the way, we have turned off IPv6 on all the computers. The network environment is Windows 2012 R2 standard.