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Yellowing of boxwood foliage could be attributed to different factors, soil fertility (fertilization), water management, frost damage, and the most serious is a fungal disease called "boxwood blight".

https://www.courierpostonline.com/story/life/2015/09/04/boxwood-blight/71720224/

https://www.nj.gov/agriculture/divisions/pi/pdf/BoxwoodBMP.pdf

It is impossible for us to diagnose the problem without photos and more information on the growing conditions and maintenance practices. There is no magic pill, treatment depends on accurate diagnosis.

We suggest that you contact the local Master Gardens through the county/university extension service and first rule out boxwood blight.
Rutgers master gardener in Essex County:
https://mgessex.org/

Now would be a very bad time to do this. July would be a much better time to prune these. Doing so now would not give the shrub enough time to harden off before frost arrives, and would risk the health of the shrub.

This article will give you more information: https://www.gardeningknowhow.com/ornamental/shrubs/boxwood/trimming-boxwood-bushes.htm

A general recommendation would be to deep water once a week during the hot dry summer and fall. But your plants may need more or less than than depending on the soil and growing conditions, and how you go about watering.
Superficial irrigation that only gets an inch penetration into the soil won't do it. You need to use a sprinkler or preferably a "soaker hose" to slow water for a couple of hours or more in order to achieve wetting of the top 6 inches of soil or more. If you mulch the soil surface with a 2 inch layer of compost, it will help to retain soil moisture for a longer period of time.

A soil moisture meter can help to take the guess work out of when to water.
https://www.domyown.com/luster-leaf-rapitest-mini-moisture-tester-1810-p-7732.html

I vote for the middle way. Prune lightly to shape, but not severely.
https://www.gardeningknowhow.com/ornamental/shrubs/boxwood/trimming-boxwood-bushes.htm

And be sure to disinfect your pruning tools (Lysol aersol or 10% household bleach solution); there is a devastating fungal disease called "boxwood blight" that is spreading in some eastern US states including Florida now.
I mention this not to scare you, but so that you can take preventive action to avoid the disease.
See the section on 'Management' in this article:

http://blogs.ifas.ufl.edu/pestalert/2015/09/15/boxwood-blight-detected-in-florida/

Unfortunately, this can be many different things depending on the exact color and look or feel of the leaves. This article will give you a way to identify your problem, and offer solutions to help correct it: https://www.gardeningknowhow.com/ornamental/shrubs/boxwood/yellow-or-brown-boxwoods.htm

While you can take cuttings almost any time of the year, the best time is when the stems are flexible enough to bend, yet still snap when pushed beyond their limit. That happens about a month after the plants put forth new growth in the spring and continues into late summer. This allows plenty of time for the roots to mature before winter arrives.
Strip the bottom half of the leaves off and dip the ends in powdered rooting hormone, then tuck the stems gently into a well-draining potting medium and water thoroughly. A loose, plastic covering creates a mini-greenhouse that stays warm and moist.
Roots should develop within about three months.