If it was solely stupid pilot tricks, they'd have laid all the blame by now.
So I'd guess there's a systemic problem, either with navaids or the airplane. They have to tread carefully and methodically before handing down verdicts which could significantly impact entire fleets or navigation systems.
The 145 is known to have an issue with LOC tracking...
But still, make sure you have the required visual refs before descending below 100'.