https://www.gamespot.com/articles/intel-says-do-not-use-the-latest-security-patch-fo/1100-6456248/

In light of the Spectre and Meltdown security issues embedded in CPUs across the board, Intel put out an early version of a firmware update to help resolve the problem. However, Intel itself has come out and said that it is now recommending against using the updated firmware in its current state due to system instability and crashes.

Intel executive VP Navin Shenoy gave an official statement. In part, he said the following: "We recommend that OEMs, cloud service providers, system manufacturers, software vendors and end users stop deployment of current versions, as they may introduce higher than expected reboots and other unpredictable system behavior."