Hi,
I don't know what hhps is, but I had similar problem to connect via the 4G-net, I use ddns and I did found out that it was problem for the router (with the latest firmware) to update the ddns service.
No problem at all with the earlier firmwares.
However, I use ***.ddns.net at noip.com, and hadn't used a custom settings service before, before I used noip.com in the "Service" field, with the latest firmware I had to use
"custom" settings for ddns, and putted in ddns.net in the "Custom update URL".
Then the router updated ddns without any problem again.
I don't really know what hhps is, but if it is something similar to ddns service it may are the problem...