Page doesn't load: net::ERR_CONNECTION_TIMED_OUT

I used Web Video Caster for a very long time now without any issues to cast yoga videos from the page www.alomoves.com.

Since a few weeks I am experiencing a very strange issue. As soon as I enter a alomoves URL in the Android app, the page partially loads and then stops. A reload turns into this error:

Website unavailable. The website under (URL) Could not be loaded, because net::ERR_CONNECTION_TIMED_OUT

NOW, when I go back to the Chrome on my Android none of the alomoves.com URLs work anymore. The main domain and any subdomain will result in the same loading error.

The only solution is a router restart. Then it works and the next day or so when I want to stream a video from that domain it is the same all over again.

Btw: I have no issues at all browsing on that page on my phone until I open it once in the WVC app. Also, the page stops loading on any device in the entire network.

Can anybody explain this or even provide a solution? This is super annoying.