As a smart tv user, you know this app (IPTV) is not developed by us. the best way to solve any problem is by contacting the App developer.
We are not responsible for the app in any matter, we give you the Playlist to play it with your app only.
however, we can give you some tips that might help you solve the issue with your Smart tv app.
1- Delete the app and install it again, this can force the App updates.
2- Unplug the TV and internet router off power and plug them back again, make sure internet is connected. then start the IPTV app again.
- Important Note: this app is not for us, this is an app available on smart tv for sale, you can have it for 7 days free from the TV app store, then it will ask you to buy it for one time payment. More info can be found at siptv.eu