Procumbens Junipers are tricky. Most people make the mistake thinking they are real east to grow, I say nay nay, they are difficult in any number of ways, little ways you might not think about till you're asking why the tree died. Don't rush them and don't man-handle them in the begining. Many times I hear the question as to the loss of branches for no appearant reason. However if you lifted the branch or moved the branch in the wrong way it can be broken at a joint that will not be noticed until the branch starts turning brown and crispy. I have found that they do not like to go as long without repotting as many conifers. I have found that four years between repottings is about the most time one of them can tolerate before they start looking like something's wrong. This is probably due top a break down of the soil structure and the slowing of the drainage.