@91stefan 

Hi, welcome to the community.

On the Deco, most of the IPTV scenarios I have seen are only one Ethernet connection from ISP Fiber ONT which loads both the internet data and IPTV data but would be separated by VLAN tags.  In your case, you already have two separate physical connections for Internet and IPTV service. I think it might be a problem.

The default working mode of Deco X20 Is also a wireless router. It is quite like, the original IPTV signal from the Fiber service needs to pass two NATs before reaching the Set Top Box.

So I think you might still need to connect the STB box directly to the ISP router via a long Ethernet cable, or a pair of powerline adapters would also help.

Thank you very much.

Best regards.

  @91stefan 

Hi, Thanks for getting back to me.

I did see Double NAT could interfere with the IPTV streaming but I might be not able to explain clearly what had happened further. I will check with the engineers if they have a better explanation.

By the way, may I know your IPTV service provider and the model number of the ISP fiber router?

As for the reboot schedule, some Deco models have supported this feature, but the current firmware of Deco X20 V4 has not added yet.

Thank you very much.

Best regards.

  @91stefan 

Thank you very much for the details.

I would like to follow up on your case via email and forward it to the senior engineers for further assistance.

Please make sure you have got an email from us.

Thanks again.

Best regards.