Don't understand what is going on, the 633 has been ok for a couple of weeks since my last episode of connection issues etc but it's playing a blinder tonight. Can connect over 2.4ghz occasionally, with random devices but it seems to get worse a short time after resetting the router - internet is none existant due to wifi spikes I saw in Inssider tool.
It is SO frustrating at the moment, never had problems with other routers.
Here is a screencap -
The signal level of the router seems to level off when I put my mobile phone data connection on but is just completely unusable and can't connect still.
I tried the 'reset' button too earlier but nothing, sick of this dodgy Wifi router.