Q.aeoniums
We have 2 aeonium voodoo which have been outside the house during the summer. They have grown really well, and looked very healthy when we brought them inside for the winter. They are now dropping leaves at quite a rate. Should they be doing this, or what have we been doing wrong!?
Your plants likely are stressed and dropping leaves as a result. Check watering, soil should not be allowed to dry out, but if the plant sits in soggy soil it can die of root rot.
Make sure you are giving the plant plenty of indirect sunlight.
Here is a link to refresh you on the care requirements.
https://www.gardeningknowhow.com/ornamental/cacti-succulents/aeonium/growing-aeonium-plants.htm