[RT-AC68U] Can't connect to certain websites (USB 4G Dongle)

Hi there,

I have an ASUS AC68U and I'm running Merlin's firmware version 374.43_2. Unfortunately I cannot upgrade to the latest version because my Internet connection comes from a USB 4G Dongle (which does not work with the latest firmware).

My problem is that I connect to certain websites. Occasionally, other websites take a while longer to connect (like...

[RT-AC68U] Can't connect to certain websites (USB 4G Dongle)