I have the Gateway system and it freezes all the time, sometimes 3 or 4 times during a hour long show, I have to change channels to get it to come back, I saw other reports so I answered some of the questions below.
-Does this happen on only HD channels? all channels
-Does this happen only during certain hours? any time
-Does this happen mostly when you change channels, or does changing channels then back again resolve it? Changing channels brings it back
-Is this happening on all Portals (if you have more than one)? yes
-When it freezes/pixelates, is it just brief and sporadic, or does it continue for a long period? both but, continues for long periods, have turned TV off and come back hours later and still frozen