Please help my Kiwi Ti houseplant! (Cordyline fruticosa)

laura.louise.1998

Hi, i have had my Kiwi ti plant for 2 years, recently it’s bottom leaves have been quickly turning yellow and dry/crispy. 
I currently have 3 yellow leaves and 2 have died in the last week. 
The plant is misted daily and was repotted in spring this year. It is currently by a south facing window however i suspect it has not had very much sun due to the very poor winter weather i have had the last month. In winter, i water the plant once it’s dry. 

Any ideas? 
Many thanks