EX6110 Connection Issue

This extender is driving me craxzy.  Before I put a hammer to it I thought I'd try the support forum.

I cant tell you how many times I've reset it, updated the firmware, etc.  I go through the connection setup, and all goes ok, but ALWAYS eventually it stops having a connection to the internet.  The lights remain on but it just wont connect.  This sometimes happens shortly after setup, sometimes a few days.

It happened in my old house with different router, I eventually bought a better extender.  I now have a second home so thought I'd try again with EX6110 considering its a different house, different router, etc.....exactly the same issues.

Shall I take a hammer to it or can somebody perhaps help me through troubleshooting thats not just off/on, reset, or redo setup?!