Archer C6: Multiple issues with 2.4 Ghz wifi
Greetings. I recently bought an Archer C6 (US) v2 router. I am facing multiple issues with the 2.4 Ghz wifi network. First I will detail out the network:
DSL splitter --> DSL Modem --> Archer C6 router
DSL Modem: is configured in bridge mode and has only one device connected to it i.e Archer C6.
Archer C6: is configured with internet connection type PPPoE. Two wired devices are connected, PC (on LAN1) and IPTV (on LAN 2). Both 2.4 Ghz and 5 Ghz wifi are enabled with most devices connected to the 2.4 Ghz network. Smart connect is Enabled.
Problems:
1. All devices connected to the 2.4 Ghz network will not be able to connect to it after some time. Usually this happens when we wake up in the morning which is to say after long periods of inactivity on the mobile devices however the devices can loose connectivity at other times too. When this happens, in the wifi settings (android) it shows "Obtaining IP address" but it never connects. The device connected to the 5Ghz network does not face any issues.
- What I have tried already: Resetting the router, turning the smart connect option on/off, disabling 5 Ghz network, reinstalling firmware.
- What temperorily fixes the issue: Restarting the router, changing any random setting in the wifi settings on the router and pressing save button.
2. Sometimes the devices connected to the 2.4 Ghz network are not able to access the internet. The internet works on PC (connected through LAN) and also on 5 Ghz network at the time when 2.4 Ghz devices are facing the issue. Disabling and re-enabling the wifi on mobile device fixes the issue.
3. The DHCP service always provides the same IP addresses to the connected devices (for example: Cellphone 1 with mac address xx-xx-xx-xx-xx-xx will always get 192.168.0.119). Restarting the router, resetting the router, disabling wifi on the connected device etc etc does not change the IP. Is this normal behavior? Shouldn't the DHCP provide random IP addresses everytime?
4. Enabling the "Local Management via HTTPS" option shows "invalid security certificate" error (pic attached).
Note: The only setting I changed related to DHCP is the Lease time (1440) but if I remember correctly I faced the issue even when it was at the default value (120).
Internet: I have a 15 Mbps ADSL connection.