hello i change to a new internet provider than i got black screen , than i went to reset iptv on the web i also change port than work , but a soon i change channel than i get black screen even on the channel that was ok . so i have to go again to change port and reset iptv for the tv to work only in one channel any channel but as soon i change channel i will get black screen over and over . please any help ??? thank u guys