Answer: Japanese Euonymus are evergreen shrubs so what you describe sounds like winter damage. They are hardy to zone 7 (zero degrees F) and require full sunshine. Your plants may be struggling due to lack of all day sunshine, and cold windy winter weather. I'd prune back the damaged plant parts to allow healthy new stems and branches to develop. Once the plants are fully established they should be able to cruise through your winter weather without problem.
Best wishes with your landscape!
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