Hello,
Based on information you provided, my best guess is that the traffic is SNATed. So when primary link fails, session is forced to go via another ISP, because route stops to exist. But when primary link recovers, if session is SNATted, it is not forced (route still exist). This setting should help to resolve this:
You can use 4G when using the free app at cinema hd.
I'm also facing almost similar issue while I'm searching for how to watch harry potter movies in order, but after the update the issue was finally resolved.
This is a Fortinet support forum. Are you using pfSense or FortiGate firewalls?
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