Hello Stephen. I am sorry you haven't received a reply to your post yet. Perhaps after my comment, your post will go to the top again and someone else will chime in. I'm no expert.

You may want to repost. The snake plant would be best seen under the Succulents and Cacti topic. Container Gardening is also a very active topic.

I wonder if your plants have stem rot or root rot. I have to wonder when these plants were last repotted. Also where are they being kept? And how often are they being watered? Have you inspected under the leaves for bugs? The more detail provided, the better the solution that will be suggested.

I hope you don't loose your chinese evergreen. Some emergency help will give the plant a good chance of survival.

It was repotted last summer. It has been in my garage with plant lights since November and watered once per week. I didn't see any bugs. This began last week. I noticed two fallen stems then yesterday all of them fall. Soil is not overly moist.

You don't have your zone listed so I don't know where you are. What is the temperature in your garage and why is the plant in the garage?

Greensboro NC is where I am. Temp in the garage I'm not sure. Average winter day here is 40-50F and nights are 30-40F. I have cats and dogs so this and other plants I have are there until spring when I can put them back outside on my deck.

I agree with SoCal Stewart. In addition your chinese evergreen is also too cold. See this link:

https://www.ohiotropics.com/2020/06/27/aglaonema-chinese-evergreen-care/

At those kind of temperatures you barely need to water. But it is just too cold for the plant. When the plant is in those kind of temperatures it's not growing, so water requirements are greatly reduced.

You should repot the plants removing all rotting roots. You need to put them in temperatures that are closer to 70 degree F.