It appears the method I was using to turn off Wi-Fi no longer works but the alternative procedure holds and poses no issues.
So which method works and which one doesn't? They claimed to have fixed the wifi on/off problem, so it looks like they've only done a partial fix.
@YetAnotherAcc OK the one that works now is the button on the front of the device. Previously you could log on and disable it in the GUI. You can still do this but it does not stick when powered off and then back on.
Thanks. Had a bit of a play. After turning on, when wifi is off you have to press the button twice (about 10 seconds apart) for wifi to stay on. So yeah, its a bit of a mess.
Never got one they said they would send me one never arrived, as usual, I have to follow up., you don't know how many problems I had with all the Sagemcom modems I got 4 of the older ones and was sent then 5366tn never worked. never got sent the power supply they said they would.