How about the lights on it? Is the wireless light on or flashing? When you reset it by reset hole on the device, did you see all the lights come on and off? Can try different web browsers, clear the...

After the phone connects to the wifi, is there any IP address? How about forget the network on the phone and reconnect again?

Did you check the modem with the support of modem? Can check the log and see what happened on the modem. BTW, how long did you test after you unplug the range extender?

You can update both the Deco units and the APP to the latest one, now the weekend is Friday and Saturday on the latest version.

Hi Naiar, yes, the connection will be faster and more stable in AP mode, you can try that first. And you can still keep the SSID as you like.

Currently it only supports IPsec VPN passthrough, which means that it allows IPsec VPN data transferring, but cannot set up IPsec site to site VPN on the router.