First i do not think it is a mytv/z7+ problem.
I am from portugal and i use a known provider that i do not know if i can put his name here.
my box takes 20 seconds to change channel, it was working for 2 months (same provider) i press + channels - it changes -it stays buffering for 20 seconds exactly.
this does not happens on all channels about 70% of them !!??
my provider says its dns cache and also a lot things (most of them do not make sense) including the box is broken!! and so on, i reset the box, i clear caches, and done a lot of things more.
I am network admin so i have a fair idea what i am doing.
Does any one has a similar problem, help will be appreciated.hanks
T