Scared of me all of the sudden

I have had my veiled for about a year and he has always been ok with being held and being around me, but lately when I open his cage to feed him he hides from me. He is about 1 year and 3 months old. He has always been ok with hand feeding and still eats out of my hand but other than that he tries to hide when I am around. Why does he do this and how can I get him comfortable with being around me again?
 
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