wake turbulence
I could understand this post if it were an A319 following at B777 heavy, but a 738 and 752 are about 20,000kgs different in the max landing wt. With correct separation it is not an issue.
The post I read that mentioned this also went on to say that it could not be confirmed if the preceding 752 was on the same approach / rwy as the 738 and so is pure conjecture