Illustrator Creating many PNG and TMP files

Hi,

We have been using Illustrator latest version in a Windows 10 pro 32GB Ram with SSD desktop PC.

Since recently, while we work on many .PNG files and PNG.TMP$$$ types files are created inside the working folder. PNGs are created as 1.PNG, 2.PNG....211.PNG and within same folder 1.PNG.TMP$$$, 2.PNG.TMP$$$.....211.PNG.TMP$$$ likewise around 400 files are appearing. What could be the cause of this?