@Hamster1962 

Hi, by combined Wi-Fi do you mean the Smart Connect is enabled? It is suggested to try to disable it and manually select a clear 5GHz channel to confirm if the issue is resolved.

Please also check and enable the IGMP Proxy and IGMP Snooping on the C4000, try both V2 and V3 on IPTV/VLAN configuration page.

How about other internet services on the C4000, are you still able to get online when connected to the 5GHz? How about the internet LED on the AX20, is it always solid green?

How about the network bandwidth provided by your ISP? Try to disable the QoS on the C4000, reboot the router and TV, then confirm again.

@Kevin_Z 

Thanks for the reply. I'd rather keep Smart Connect enabled if possible so I don't have to juggle the whole families connections. That was part of the whole idea of a new Router. I did try and pick my own channels but Smart Connect reverts them back to Auto. All the other devices we have are fine. Just the issue with 4k Streaming on the TV.

I'll try the IGMP Settings but not this week as World of Warcraft Expansion Pack is out tonight and if I break our internet, life won't be worth living.

Everything else works fine LED always solid Blue and no re-boots.

ISP Network is UK Virgin Media, 400Mbps, speed tests confirm this at 380Mbps.

Hammy

@Hamster1962 

Thank you very much for getting back so quickly. You may take your time to do the troubleshooting when it is convenient for you, game first :)

BTW, we don't mean we need to disable the Smart Connect in order to use the router, we want to see if there is anything to do with this specific feature, as you mentioned there is no way to choose a channel or channel width manually once it is enabled, so we want to disable it and confirm if that really makes a difference. You may try to disable the Smart Connect feature on the C4000 and try to manually select a channel and adjust the channel width on it, then apply the settings I mentioned previously to monitor the connection on the TV.

Have a nice day.

@Kevin_Z 

Ok, Thanks. One last thing. I did try and disable QoS but could not find a way of doing this. Only to leave it as 'Standard'. Does Standard mean it's OFF?

Kevin S

@Hamster1962 

Yes, leave it as Standard and ensure there is no device in the High priority list.

@Hamster1962 

Hi Everybody

I just thought I would post a quick update. I followed all the advice given and few more ideas which i found on the web and basically, this £155 Router is incapable of streaming at sufficient quality to watch anything at 4K on a fairly basic 4K TV.

Which is a shame as a rival, cheap (Less than half the price), Chinese Tenda Router streams 4K fine. Only trouble is the Tenda re-boots at least once every two or three days. Making it slightly more useless than the TP-Link.

Lessons. Don't buy an AC4000 Router for its stunning WiFi. Because its rubbish.

Be prepared to go to the trouble and expense of hard-wiring your TV.

Hamster

@Hamster1962 

Sadly, returned to Amazon as useless.

H