Hello my good friends,

I have 2 of the 3900 buzz boxes and I love them very much and I really thank Buzz team for their exceptional work
One of my 3900 boxes works perfectly while the other one has the glitch that when I click to change channels for a 1 second or 2 I get a black screen and then it changes the channel?!
Why is that happening? and it does that with all of the iptv portals/servers.
Thanks