Fail loading streams

Dear forum,
I have this list of free streams that for a pair of months worked on my Android device (mid-high level) using Kodi and IPTV simple addon. I never had any issues such us lag, buffers, crashes. But now it stopped working.
The m3u list is working, I checked it with vlc on my laptop, also it contains those channels freely available on the website of the provider and on standard tv so the links won’t be removed.
Basically after the start of the application, it loads all the channel properly, but when I tap on tv and the full list is shown, if I tap on a channel it doesn’t start streaming. Sometimes kodi shows the little clock suggesting that it’s trying to load something, but it fails in a while silently.
I tried resetting my smartphone, same problem.
The connection is strong, stable and fast.
No firewall in the router (vlc streams properly on w10).
Kodi 16.1 , Android 6.
Thanks for takung the time to read this.