Yes, we had the very same situation in my previous company....At the beginning of this fiasco... As their supplies of motherboards dried up, their willingness to overnight the need parts disappeared. Fast forward another two months, and we were looking at 1 out of 4 GX270s out of service, and Dell unwilling and unable to honor their warrant support (Silver in this case). It took papers from company council to get Dell to agree to a PFR (Proactive Field Replacement) on most GX270s in inventory (~100). During this process, we were told that only certain production runs, which were identifiable by asset tag) were faulty. 3 months later, they were back to replace those also.
In the end, we certified our internal helpdesk technicians as Dell authorized warranty support. By doing this we were at least able to recoup some of the costs, as it does not take much extra time to swap out the motherboard when you are already inside looking for failed caps.
Shortly thereafter, our account reps were calling, asking why their sales volume had dropped off....
Just one of many Dell related storied I can tell.... The one with them moving Gold support to India with no warning was another fun one..
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Keep your boss's boss off your boss's back.