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[#1]

Wi-Fi has an intermittent unpredictable problem. Usual speeds are 70meg but sudden connection drops occur along with a message to check connections etc., Wi-Fi connections all normal in PC, laptop and iPhone but will not connect. Problem started 3-4 days ago, previously very stable. I installed a BT extender a month ago, then 2 Huwei wireless range extenders but had no related connection problems.   

[#2]

Hi there,

It might be worth looking into changing your wireless channel (if you haven't already). There's a video on how to do it with your specific router here: https://goo.gl/ixe8q5

I recommend downloading a wifi analyser/scanner app which could help tell you whether there is congestion on certain wireless channels or not.

Trial and error your way through this, and see if there's still any problems connecting.

Matty