This is a comment from the author of this article. Perhaps this is FUD that has made XMR plummeted in the past day.
"Cybersecurity firm Varonis has discovered a new encryption virus to exploit the Monero cryptocurrency (XMR), potentially avoiding detection.
Named "Norman", one of its key features is closing the cryptocurrency mining process in response to users opening Task Manager. "
Thats no FUD, that virus / malicious malware exists and is doing damage. But i doubt its the sole reason for the decline.
Link :
https://www.coindesk.com/new-malware-miner-sneakily-hides-when-task-manager-is-openBut lets face it, a lot of altcoins are currently facing an extended pullback. I guess the bottom has just not been reached yet for most altcoins
or they are facing a re-testing of their bottom.