I phone and I pad will not maintain internet connection when more than a meter from hub.after outage

[CarolynM1]

We have had an outage resolved this evening. I have reset hub and reconnected 2 extenders successfully using  WPS buttons. The third one won't connect. 

My service checker says all is good. 

The sky account is visible to both phone and tablet but the buffering icon is continuous unless I'm right next to the hub. 
Anyone got any ideas?