Might be overheating of your TVbox, try to put it on the side so air circulate better around it. You can also try to put a fan next to it to see if that helps.Why do some streams:-
Freeze for a second maybe 3
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.
I accept its part of IPTV but whats going on?