2 Chronicles 32:31 "God withdrew from Hezekiah in order to test him and to see what was really in his heart."
Pride was in Hezekiah's heart according to 32:25.
Sometimes when you feel that God is silent it just might be a time for you to see what is really in your heart: pride, unbelief, hatred, etc. God knows what is in your hearts; I am the one who needs to see. It is only then will I want to change, and cry out to God, “HELP ME.”