NVIDIA seems to have finally acknowledged that some of its GeForce RTX 2080 Ti Founders Edition cards seem to have missed testing during QA and that could have been the reason for the increasing number of complaints about faulty cards causing all sorts of problems. Those affected can directly contact NVIDIA Support to get their issue resolved at the earliest.
https://www.notebookcheck.net/NVIDIA-admits-a-few-early-RTX-2080-Ti-Founders-Edition-cards-managed-to-escape-QA.362546.0.html