I don't have a good answer for this. I run into the exact same issues, and I work at NI! For a while I would file CARs with a [hard to reproduce] tag on them, but I don't think anything ever came of those. I've heard of customers actually visiting NI and bringing their entire setup to get an AE to spend days troubleshooting issues like this, but I think that's overkill in almost all cases.
One thing I can say...I've heard customer sentiment that it's not worth the time to submit NIER crash reports, but that's absolutely *not* true. With each LabVIEW release since NIER's debut, we've fixed *several* crashes as a direct result of the crash reports that were sent in. So continue submitting crash reports (and attaching code where possible and appropriate), because improving stability by solving NIER-reported crashes is something we're committed to with each release.