Subaru WRX breaking rear traction

[boyracer]

Just wondering if anyone else wants to lend weight to this theory.
The other weekend a driver I was servicing for ended his rally with the WRX in the trees. A fast right 2 corner, nose in and everything seeming fine when all of a sudden the rear seemed to lose traction with the usual result of running wide, touching the trees and game over.
Nothing much thought about it, driver is compotent driver, though perhaps not as familar with a 4WD as some (most of his dirt racing being FWD, mostly tarmac with the 4WD) and was pushing hard, so easy to ignore.
Just watched some coverage on the national championship over here and another driver who ended in the trees, seemed to have the same explanation for his excursion into the trees. This time a tighter right hand, though still fairly quick. Same unexpected break away in the rear end. This in a completely different part of the country on a vary different rally.
Just wondering if perhaps we're missing something that the rest of the rally world is already aware of ? I know one of the local manufacturers teams used to rewind the electronic centre diff for a stronger engagement.
Not sure if both teams were running the same suspension ?
Maybe nothing, but thought I'd ask