why is my ZZ plant crying?

My zz plant is dripping water from the leaves.  

Why?

Not sticky, no bugs, tastes like water.  When dry is slightly powdery/gritty.  

Maybe I shouldn't have put strange plant juice in my mouth, but meh.  

About half a dozen leaves are crying today.  

Only big change is a lot less light this week due to weather.
I watered it yesterday.  I'm watering it every 2 to 3 weeks in the summer.  This was the final water before winter when it will get water once a month or two months.  

According to this article, https://www.nature-and-garden.com/gardening/zz-plant.html ,  those are happy tears:

This is a normal phenomen and is the sign of a happy, well-watered specimen. It’s called guttation or weeping leaves.

Night-time and early morning
Plants breathe at night and still need sap to flow up and down the plant. Guttation takes over to force sap and water up when transpiration stops being effective.

Daytime breathing is powered by transpiration or “sweating”. In warm, dry air, water evaporates from leaves and creates a “vacuum” inside the plant.  This vacuum pulls nutrient-rich sap up.
At nighttime, evaporation and transpiration don’t work as well. The plant compensates by having the roots push water upwards. To do this, roots use chemicals to attract water from the surrounding soil.
This builds up pressure in the plant and sap and minerals are pushed up. It’s such a strong phenomenon that excess water needs to be released at the tip of leaves through guttation!
Days of high moisture and humidity
When the air is near or above 100% relative humidity, it’s impossible for a plant to sweat.

Even during daytime, guttation must take over to get sap circulating through the plant.
Excess moisture in the soil
It isn’t a common reaction, but guttation is one way of helping the plant evacuate excess water around roots. It’s a coping the plant uses to protect roots from rotting.

Some plants use guttation to drain the soil around them like the weeping willow tree which thus is doubly weeping!
Guttation isn’t necessarily a sign of over-watering.