Replacement 8500s freezing?

I've had an 8500 for about two weeks now. I too have seen the freezing problem that others have described. I'm curious as to whether anyone that has received a replacement machine from Dell has continued to see the problem.

I talked to Dell tech support today and the guy I spoke with made it sound as though he'd never heard of such a problem. This is a concern. I want to figure out what to do before the 30-day money-back period expires.

Thanks!