what is wrong with my tree???

Helpp! My 2 bonsais have always been beautifully green, well maintained and pruned. They are always kept outside under a small canopy in the partial sun and in the winter they are kept in the garage. However, recently the needles have started to turn completely orange and the bark is peeling...

I own eleven trees. All of them are doing well, prospering, growing, etc. BUT THIS FICUS DEAR GOSH! I only water when it needs, I have made sure it gets good light and not too much, it has been outside for weeks yet continues to lose foliage. I am out of ideas, help me Bonsai Nut, you're my only...