Cannot access the server over network

Server Version#: 1.20.1.3252
Player Version#: 1.18.0.1392-cf94f6a1
Router: NEC Aterm WX6000HP
ISP: UPnP disabled, but NAT ok.
<If providing server logs please do NOT turn on verbose logging

Hi!
I tryed remote access, but cannot set as below.
I confirmed WAN address port (34001) is opened, with https://canyouseeme.org

My iPhone’s Plex client can access over LTE network (without WiFi).
But sometimes, iPhone client cannot access.

Why? and What can I do?

Sincerely.

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