Extender disconnects at specific time each day

Maybe try downgrading the firmware a version? 

Actually, I have just updated it a few days ago.

Let me clarify it.

4/5 weeks ago I noticed this problem (probably was there even before and I did not notice it).

I tried several solutions (even resetting multiple times), but none of them worked.

A few days ago, I logged in the extender webpage and it told me that there was an update.

I thought that this could solve the problem, so I updated it.

But unfortunately it did not solve it.

I think that was the first time I updated the extender (a part from when I bought it), so I do not think the problem was in an update.

But I can try to downgrade to an older version.

Do you have a specific one to suggest me?

Thanks 

If the downgrade doesn't work, the only other thing I'd have you try is a different router. Maybe see if it works fine at a friends, neighbors, family members router. Or even an old router if you have one. 

The router is still the backbone of the system. If its still whats causing the issue (and isp supplied routers aren't known for stellar performance/features), nothing we change on the extender is going to help. 

The downgrade did not work.

I have not tried yet with another router, but I connected another extender (of another brand) to the same router and that one seems to work fine.

Does this help with the diagnosis of the issue?

Thanks

Not really. 

It could still be the router having issues with netgear or it could be the extender just being bad. Its why I'd try it with another router. 

You could even try hardwiring it in and using it in access point mode. https://kb.netgear.com/25715/How-do-I-install-the-WN3000RPv3-as-an-access-point