I have two of these extenders set up in my property. One laptop is unable to maintain a connection to one extender.

Extender 1 is downstairs.

Extender 2 is upstairs.
 

I can connect laptop to extender 1 (located downstairs) while upstairs. Signal is weak however.

I have a company laptop and my mobile connected to extender 2 which works fine, both upstairs.

I cannot maintain a consistent, stable connection with my personal laptop to extender 2 even while sat right next to it (no Ethernet port available).

Either:

* Laptop WiFi adapter cannot connect to extender (stuck on "connecting" status)

* Laptop connects but no internet signal (Laptop WiFi adapter is disconnected - no IP address)

* Laptop connects to extender for a few minutes then signal drops.

Monitoring the devices connected I can see that the laptop joins the extender then drops off.

To clarify, I have validated that my laptop works with another extender on the same network, and other devices can connect to the problem extender. I have two laptops side by side: one connects to extender 2 and the other one doesn't.

I used this laptop to set up both extenders so cannot see why it is not working.

What is the problem here and how can I fix it?