i think i have the same problem as u..

My whole family phone when connected to wifi 2.4 or 5ghz,when open youtube,it will loading but need wait for 30seconds for the video to be load...then
I need to turn off my phone wifi and reconnect back to have smooth connection,but after 1-2minits..the problem arise again..need wait 30seconds for video to be load..same goes to instagram...i scrolling scrolling,suddenly it loading and have to wait 30seconds for the pictures to be loaded again..then after few minits..the problem occur again..then wait 30seconds again..then smooth again..then need wait 30seconds again...it like the line sent data to server but the server slow to respond to our phone..all apps is the same..we have to wait a while to get smooth connection,then after few minits..we have to wait a while again to get smooth connection..
my router is rgx4400..do u guys think is router fault?or some settings need to be adjusted?
wifi on laptop no problem,lan cable on my desktop no problem..but only phone wifi got problem..

I have the same problem too.. Did you get yours replaced?

I wonder if both silver colour  Fibre Termination Unit and rgx4400 are problematic

Dyson Jin Victor3010
I was at the restaurant that uses the RGX4400 earlier today. Did a test on 2.4Ghz. Browsing seems fine. No stalling that I can discern when loading a website. Speedtests however shows the difference between 2.4 & 5GHz. They're on UniFiBiz 100. Not many people when I was there.

300mbps TIME?

Is the 5GHz on the RGX4400? As AP only or routing as well?

Shouldn't be a load problem. The RGX4400 at the restaurant handles the crowd just fine. Tonight I'd estimate at least 10-15 people were on their phones. It's more crowded at lunchtime and I've never had probs. Dunno what could be wrong. The RGX4400 is 2x2 MIMO btw, i.e.: AC1200. Maybe it's their antennas.

This is both iFlix on iPad and iFlix on STB right? I've seen my STB iFlix buffer once a while but not very often. I think could be the wifi connection, for me anyway, because my STB is in my living room which is furthest away from my wifi router. The HyppTV box, granted, is not a very powerful box but it probably has HW video decoding so it shouldn't be a CPU problem. I'll check it out later but I believe iFlix streams are not of very high bitrates. Also possible that it's increased load on iFlix's servers since it's free again for another year.

Definitely a prob with the router. Somehow SSIDs 1 and 2 are also bridged to vlan600 where the HyppTV dhcp server is.

How are the vlans configured in your rgx4400? SSID3 is a child of which SSID? Nvm, it's 2.4ghz so it's a child of ssid1.

Normally on consumer routers, by default, all wlan interfaces are bridged together. I dunno whether it can be configured otherwise in the webgui.

Hi bro. I am using this router. Apparently out of sudden, the 2.5 ghz is no longer detectable in my router. Only 5 ghz is available. Have you encounter this problem before? Sigh. Yesterday and this morning still ok. If this router gone, will need to buy new router due to my contract has ended and I do not want to renew with the TM

TM wants to renew my contract if change for me 1 to 1. No point renew with them with lousy modem. Better get modem myself with 2 years warranty