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The Euphorbia trigona is know to have branches go limp from time to time.

Exact cause is unknown in your case, but check to make sure the plant is receiving good light but not direct sunlight.
Keep the soil mix damp, but not soggy.
In winter keep it slightly on the dry side.

You can prune your plant and even grow new plants from the cuttings.
This is a good way to keep the plant size in control.
Keep is mind that the sap of this plant is poisonous and care should be taken when handling your plant.
Use gloves and to not get the sap on your skin or near eyes and mouth.

If you suspect an insect or fungus; use Neem Oil.

https://www.gardeningknowhow.com/ornamental/cacti-succulents/scgen/propagating-cacti-and-succulents.htm
https://www.gardeningknowhow.com/search/?q=neem%20oil

Here are some links that will help with wintering your plants.

https://www.gardeningknowhow.com/ornamental/flowers/gardenia/gardenia-winter-care-tips.htm
https://www.gardeningknowhow.com/ornamental/flowers/gardenia/gardenia-plant.htm
https://www.gardeningknowhow.com/ornamental/flowers/hibiscus/wintering-hibiscus-indoors-winter-care-for-hibiscus.htm
https://www.gardeningknowhow.com/ornamental/flowers/hibiscus/how-to-care-for-hibiscus-plants.htm

I would continue to care for the plants with light watering and proper light conditions for the plants.

You can prune away any dead or dying leaves and then wait and see.

Many houseplants will suffer cold damage in temperatures below 50 degrees but some may be able to tolerate colder temperatures.

Best of luck.

Yellowing leaves can be due to watering issues; to much or to little, or insects and disease can cause yellowing leaves.

Use the search bar on the home page of Gardening Know How to learn the care requirements of your specific plant.

Here is a link to the page.

https://www.gardeningknowhow.com/
https://www.gardeningknowhow.com/plant-problems/environmental/plant-leaves-turn-yellow.htm

Investigate the exact plants that you are growing.
Gardening Know How is a great place to do this! Use the 'search' tab at the top of the Home page to search for articles on your specific plants.

Some plants may need to be allowed to go dormant for the winter months, while others need to be cared for throughout the winter with more specific needs.
Watering needs generally change while indoors and even though you have a sunny window, this may not be enough light for most outdoor varieties.
Plants can be placed under grow lights to help give them additional light.

Lack of humidity can also be a cause of plant decline in the winter. Misting some plants will help as well as setting the plant on a tray of pebbles and water.

Wait and see is the best approach.
You can trim away any dead and damaged material.
If you see new growth, they can recover.
If the temperatures were low enough and length of time to freeze the roots, they may not recover.

https://www.gardeningknowhow.com/plant-problems/environmental/how-to-treat-frozen-plants.htm
https://www.gardeningknowhow.com/plant-problems/environmental/tips-for-saving-cold-damaged-plants.htm