There are several possibilities for your needle loss. The most common is simply that the inner parts of branches are shaded and do not receive sunlight. The needles then turn brown and drop. This is a natural process. The other is the possibility of one of several diseases that affect spruce. I cannot see black fungi dots on the photos but you really need to look at the branches and needles with a magnifying glass. Check the diseases in this link. http://www.extension.umn.edu/garden/yard-garden/trees-shrubs/spruce-tree-diseases/index.html  If anything seems to match you should have a certified arborist do an on-site exam. You can find one by visiting this site and clicking on Find An Arborist:http://www.treesaregood.org/