"One has to wonder why so many failures in such a short time? 🙁"
Do we know the number? We just know they're busy. Given the small number of warranty repair staff (?2), the large number of trains sold relative to that number of staff (? hundreds of thousands, certainly tens of thousands of locomotives), the frequency of shipping damage, abuse and user error, I'm surprised they get anything done.
May be difficult to justify significant staff increase when the work is seasonal, or, more likely, perhaps there is a shortage of people suited to undertaking this sort of repair work.
In short, I would suspect your comment doesn't address the complexity of the issues, and is grossly unfair.
