Hello,
Just to share with you my personal experience.
I was also facing issues with the live view, when trying to access with my Android Mobile phone on the cellular network.
Everything was OK with WIFI, but cellular was not working, or only from time to time.
I open the network parameters for the cellular network, and I discovered that the IPv6 was activated (internet protocol version 6). I forced it to IPv4, and suddenly everything worked fine.
Hope this can help you.