Previously that pink buffering icon doesn't appear, and then when you perform Restore Factory Settings, the pink buffering icon keeps appearing whenever you change channel, correct?
You selected Plug & Play (self-install), is it?

Based on what you described, you should be selecting "Satellite".
When you select Satellite, you won't experience that pink buffering icon and "Picture quality becomes OK after 5 seconds" whenever you tune to a channel.
That scenario is an expected, well known thing for customers who are on Plug & Play. You are experiencing just like what those Plug & Play customers are getting, where some may finds it disturbing or annoying.
If you don't like that, then Plug & Play mode is not for you.

Once you select Satellite, you'll be asked for the LNB Type. Let me know if you need help on that.