Home Hub 5 - does not seem to broadcast 2.4ghz ban...

Hi, I have Infinity with a HH5 and have been having wireless connection problems with certain devices (mobile, laptop WiFi radio).  Following recommendations I have performed a factory reset and set both bands to now have separate SSID's.  Nothing I have can see the 2.4ghz band (even my 5ghz devices which I assume are dual band).  My Blackberry Curve 9360 is only 2.4ghz so cannot connect.  I have manually entered the 2.4ghz settings into more than one device but that does not work either.  I fired up a Home Hub 2 and that gets seen.  Any ideas anyone??
Thanks in advance, Graham.

2.4GHz disappearing on HH5 has been onging for many users for some time:-
https://community.bt.com/t5/Other-Broadband-Queries/Home-Hub-5-SSID-disappears-from-available-networ...
https://community.bt.com/t5/Other-Broadband-Queries/HH5-2-4GHz-Wifi-stops-working-once-per-day/m-p/1...
BT is (or should be) aware of the problem, so we just have to wait for a solution.

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