 NortonLifeLocks 6bn merger with Avast PLC LSE:AVST is facing an in-depth investigation by UK watchdog the CMA due to possible reduced competition in the fast-growing cyber security market. Shares in Avast dropped almost 9 on the news, with the CMA warning that Unless the companies can offer a clear-cut solution to address our concerns, we intend to carry out an in-depth phase 2 investigation. 