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Woolly & Creeping Thyme Turning Brown

I planted woolly and creeping thyme between stepping stones this past spring and it was doing so well. Then a small patch started turning brown and then it just kept spreading until about half of the thyme has turned brown. I don't know if I should cut it back or if it will even come back next spring. The stepping stones sit on top of a sandy base with some soil in it so I wouldn't think it was too wet for the thyme. What do you think I should do? Thanks
Submitted by BHGPhotoContest

If the sandy base sits on top of heavy clay soil, you may have a perched water table. Water doesn't readily move from soil of one type of texture into another, so although the soil near the surface may be sandy, water could be  collecting just above the clay subsoil, and sitting in the root zone, causing root rot. It's also possible that the thyme developed a foliar fungal disease. If conditions are humid and wet, it can develop fungal leaf spots.
If the foliage is entirely brown, it would be helpful to cut back the plant and destroy the dead sections to prevent fungal spores from overwintering on the dead tissue.

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