Model : TL-WA850RE

Hardware Version : V.2

Firmware Version : 20160527-rel60757 (latest)

ISP :

Hello,

I am having trouble with my new TL-WA850RE v2, intenet connection is unstable when I connect to it. It comes and goes...
So I will explain exactly how i set it up:

I have:
Router 1: The one that my Internet provider gave me. I can't access configuration here. no wifi.
Router 2: I connected Router 2 to Router 1 via ethernet cable and configured a WAN and a LAN to have internet in Router 2. Router 2 provides wifi. Configuration works perfectly. Any device can be connected to Router 2 and get internet access.
Extender: the TL-WA850RE v2 was connected to this Router 2 and configured.

Now I will detail the configurations:

Router 1: I can't access the configuration... but:
IP address: 192.168.1.1


Router 2: is connected via ethernet cable to Router 1: and WAN was correctly configured

LAN config:
IP address: 192.168.30.1
Subnet Mask: 255.255.255.0

DHCP enabled
Start IP address: 192.168.30.5
End IP address: 192.168.30.130
Leased time: 24h

As I said before, Any device can be connected to Router 2 via wifi and get internet. Till here it is all working perfectly.

Now I connected my Extender TL-WA850RE v2 to my Router 2 wifi network and configured this way:

LAN config;
IP address: 192.168.30.250
Subnet mask: 255.255.255.0
Default gateway: 192.168.30.1

And tried: DHCP: auto
internet comes and goes....

tried: DHCP: off
Internet comes and goes...

Tried: DHCP: on
Start IP address: 192.168.30.5
End IP address: 192.168.30.130
Leased time: 1440min (24h)
No internet.

I don't know why internet comes and goes... did I do something wrong?
Any ideas?

Please help!