Hi, 

(apologies if this is a bit long winded, but want to provide as much info on setup as i can in case it helps!)

Setup:

I've recently setup a home network as follows

• Virgin Media SuperHub 3.0 set to Modem Mode (I believe VM only support IPv4, or at least they had to switch something on their end to assign me an IPv4 address from the previous IPv6 before I could switch to Modem Mode)
• SuperHub 3.0 connected to Archer C80 router with IPv6 disabled and DHCP server enabled.  Address pool in range 100 - 249 (only connecting about 15 devices)
• Archer C80 connects (via LAN) to
  • Netgear GS116E Gigabit Ethernet Switch (Smart Managed) - DHCP server is disabled, but otherwise default settings remain
  • LG TV (ground floor) - relatively new model from earlier this year, connected directly to ethernet port on router
• Netgear switch connects various points around the house via CAT5e cabling, but primarily
  • Laptop
  • Archer C60 - DHCP server is disabled & device is in Access Point mode (connected via the C60's WAN/Internet port)
  • LG TV (first floor) 

The Problem:

Some devices are unable to obtain an IP address from the C80 Router, some of the time, therefore preventing me from connecting to the internet, whereas others work fine without any issues

for example

• LG TV (ground floor), which is wired directly to the router is unable to obtain an IP address randomly - sometimes when it is first switched on, othertimes after a period of time. In TV settings it will have received it's own link local IP address until I uncheck/check the 'automatically assign IP' option
  • Note that the LG TV (first floor) that is wired via the Netgear switch does not have this problem
  • IP address lease time is set to 120 minutes
• Laptop (connected via the Netgear switch) - when i switch on the laptop it also gets a link local IP address, if I release/renew the IP via command line or restart the laptop it will be correctly assigned an IP Address by the router
• iPhone - if i leave the WiFi range and re-enter it I will be unable to connect and have to 'Reset Network Settings'  and reconnect to the WiFi (reboots, airplane mode, switching on/off wifi don't work, only the reset network settings option)
  • This occurs regardless of whether I am trying to connect to the C80 or C60 router - but when I move between the two (when connection is already established) there are no issues

I had initially thought it was a DHCP conflict with one of the other devices on the network, but they are now disabled (with exception of the C80 router) & Laptop is not always switched on.  The fact that i have the problem on devices which are wired directly to the router and wired through the switch leaves me to believe the problem is with the router rather than the switch (in addition to wireless devices)

All cabling was tested & works correctly

From the AC80 logs (which i know very little about),

• about 35% of the IP assignments are NAK's  (if thats relevant),
• the following warning occurs regularly "[dhcps]Lease host name not found."  Whilst i've seen others report this issue with this warning in the log, there were no clear resolutions that I could find
• also in the log (not as frequently) is another warning "[dhcps]192.168.192.XX belongs to someone, reserving it for 3600 seconds."
  • this is not in my address pool but is the IP address that my devices (e.g. iPhone) recieve when it is unable to connect to the Internet - so not sure why C80 would be picking it up/trying to reserve it?

Would appreciate any suggestions on how to resolve, it's frustrating having to reset IP's on multiple devices multiple times throughout the day!

Regards, 

Gavin