Arbutus: Arbutus unedo 'Compacta' looking really bad

Hi All,
This is my first post. I live in Vancouver and have a large Arbutus unedo 'Compacta' that's about 12 or 13 years old. I moved it when we bought a new house 8 years ago and it has thrived. This spring it was doing great as usual until about 2 weeks ago when it started to look really miserable. Should I just wait it out and see what happens next spring or is the problem unsolvable? I'd hate to lose such a well established beautiful shrub but my garden is small so if there's no hope for it I'd rather dig it out and start again. Thoughts?

 

Can you describe the miserableness of it? Or share a photograph?