there is really an problem with the telekom. i have 3 friends an all of then have big problems!
1) 50 Mbits with a FritzBox 7590 on a fire tv stick, tested with siptv and kodi 2) 50 Mbits with a FritzBox 7362 on smart iptv on an samsung tv 3) 200 Mbits with a Speedport W724V on smart iptv on an lg tv
alle 3 have the same problems! german iptv streams works great, romanian and ex yu are not working. they load few seconds and the stream stops every 1-2 second.
on all 3 we have tested other and different DNS, not better, same result.
the fire tv stick from friend 1 i have tested at my internet connection (50 mbits unitymedia) and all channels (romanian, ex yu) works without problems.
Freeze for a second maybe 3 Buffer Go into a "loop" where video and sound abruptly stops and the last say 10 seconds of live TV is replayed then things carry on as normal.
These happen quite a lot, not just on your service though.
And its not my ISP or Router or Devices, because everyone using IPTV that I know (~50 people) have the SAME problems and they use different ISPs, different devices and some are not even in the same country.