https://www.theregister.co.uk/2018/01/12/intel_warns_meltdown_spectre_fixes_make_broadwells_haswells_unstable/

Intel’s warned that the fix for its Meltdown and Spectre woes might have made PCs and servers less stable.

Chipzilla’s slipped out a statement to the effect that “We have received reports from a few customers of higher system reboots after applying firmware updates.” The problems have hit “Broadwell and Haswell CPUs for both client and data center.”