I had an issue with my Levorg with the power steering stopping working with a clunk. Turned out to be a loose connection to the battery. On the positive connection there is the main post connector with thick cable and then a smaller cable coming off via a 10mm stud and nut. My fault as I was wiring up my tow bar and was going to use the 10mm stud to connect my 12v supply, but then saw it was protected by a built in fuse (so changed my mind as I didn't want to risk blowing this fuse). After fitting the tow bar wiring my power steering kept cutting out. That is when I found I had left the connection to the smaller wire loose and it was making and breaking. Hence I found that this wire from the battery is for the power steering supply. It must take a fair bit of power if they have given it its own power direct from the battery terminal.
So I think previous comments on low battery power could be the right direction for you.
Hope you get sorted soon.
Andy