Dataflow Error: Underlying Connection Closed by Server

Hi,

I'm using PBI Desktop. My dashboard suddenly experienced DataSource.Error at some steps when I tried to refresh from Dataflow. It was working fine previously.

I've tried a few times and the error does not always occur at the same step. I've also checked that my PowerBI version is up to date : 2.114.864.0 64-bit (February 2023). 

Appreciate any insight as to what might be causing this and how to resolve this error.