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This could be caused by malware. Load the Task Manager and take a screenshot of the Startup tab, or if you have any obvious suspect entries you should delete them and run a malware scanner like Malwarebyte's Anti-Malware.https://www.malwarebytes.com/premium/ (unfortunately, MBAM has become nagware, so you'll have to get the free trial)Its a known issue caused by a rootkit, so not every scanner may detect it.
try flash to the latest BIOS 1.1:https://www.msi.com/Motherboard/support/B350-TOMAHAWK.html#down-biosthen see how its goes
Reports are that am AGESA update in the ASUS BIOS was *at least* partially to blame for some of the bricking issues. However, it is difficult to verify much of anything at the moment.And again, you are factually WRONG about the BIOS updates. If you are running 1.10 that is YOUR fault. Version 1.31 (and several prior) have been available for a while. I'll take a BETA BIOS that is stable versus an official BIOS update that bricks systems.