@David-TP Yes, it is a HB810. Anyway, contacted Singtel and was informed there was a fibre optical issue in my home connection. They are sending technician down to check - hope the issue would be resolve in due course. Thanks for the advice anyway 

  @Keano1890 Hi David, thanks for your reply. After my last message, Singtel Engineer visited me with a new set to test. The problem remains, so the hardware has no issue. I have tried all sort of Wifi Network settings; separating the newtworks to 2.4 ghz, 5 ghz and 6 ghz. On some good day, I will see the 6 ghz broadcast, but it did not stay for long. After a few hours, it would just disappear. Completely baffled by this illusive 6 ghz network. I have wrote in to TP-Link to check if this could be a bug issue with the firmware; whether TP-Link is upgrading its firmware for their Wifi 7 sets to address this issue. Still waiting for a reply. Grateful for anyone here to share any useful information. 

  @David-TP Thanks for your assistance. Please see my correspondences with TP-Link (attached). Hopefully, we can get an the matter resolve soon. Will be grateful for any tips from the community here, thank you

  @Keano1890 Hello, same problem here with my new BE85. When seeting up my new router, my iPhone 15 Pro join the 6 Mhz band providing download speed > 1400 Mbps. However, after 48 hours, even thought my iPhone remains connected to the 6 Mhz band, download speed decreased to 800 Mbps as if if was connnected on the 5 Mhz band.

Additionnally, ISP speed remains stable (2000 Mbps download).

Can you help on this matter ? Thanks !

  @nico887 - Hi Nico, my problem remains unresolved to-date. My ISP (SINGTEL in Singapore) has arranged for a site visit with an Engineer from TP-Link this coming Sat. I am not hopeful that they would be able to resolve the problem as I firmly believe it has nothing to do with the wifi settings anymore (tried every combo there is). But it would be good that the Engineer could see the problem himself and take it back to TP-Link lab to study. A firmware update is likely to be needed here.

Your situation is slightly better than mine - at least you could see the 6 ghz broadcast. I have to put up with an illusive 6 ghz broadcast that only visits once a while for a very short period each time! 

I will get back to you after this Sat.

  @Keano1890 

I got my OnePlus 12 Singapore version and my PC with wifi 6E supported Acer predator Orion 7000. Both cannot log and see the WIFi 6GHz band. The singtel engineer iphone 15 able to search for the band. I do contact Intel and tried several upgrade for my wifi 6e adaptor driver on my PC. Only can see 1x the 6 GHz band then after that no more. Not sure is the tp link HB810 problem or not. Is someone also got same problem here? My isp also Singtel 10G service plan.