You can check if the transmit power is set to 100%. Is there a wall between your router and device? 5G will loss more signal than 2.4G when cross a wall.

Is your 3G network got a public IP address or private Ip address? If it's a private IP address,remote access is not possible.

Do you have another brand router. Will your No-IP account connect successfully? You can try to change a password and connect again.

I am not familiar with netgear products. But I think the settings are similar. You need to log in the repeater's manage page. Then search the wireless signal of 8901N. Then connect to it.

What's the ADSL status page information? Except online game,is other application got disconnected? What's the LED status of your 8961 when it drop the connection. You can also try to put it in a cool...

MA180 should work with 8968 ADSL modem. But MA260 is a better because it support faster speed. When ADSL line is down,it will switch to 3G network automatically.