Intel has stepped up and confirmed that there is a bug in its sixth-gen Core products that have the codename Skylake. The bug in question can cause the system to hang under complex workloads. The only application that Intel has confirmed to cause the issue so far is Prime95.

The problem was originally identified back in December by testers who found random crashes of the Prime95 software during the 786k test on the new Intel processors. The software would fail sometimes after only a few minutes of operation and other times after hours of operation.
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https://www.slashgear.com/intel-confirms-bug-with-skylake-cpus-12422788/