https://www.bleepingcomputer.com/news/technology/sonicwall-explains-why-firewalls-were-caught-in-reboot-loops/

In a weekend update, SonicWall said the widespread reboot loops that impacted next-gen firewalls worldwide were caused by signature updates published on Thursday evening not being correctly processed.

According to online complaints from admins [1, 2, 3], devices from all Gen 7 firewall series running SonicOS 7.0 were stuck in reboot loops starting from 9:30 PM EST on January 20 and onwards.