XR500 rebooted by itself

Today my XR500 with firmware V2.3.2.130 rebooted with no action on my part and no power loss (no power flicker, modem and pc didn't reboot). Upon logging into the XR500's DumaOS admin control panel, I noticed the admin logs were gone, other than showing reboot activity, which is expected following a reboot; however, the Router Auto Firmware Update setting had changed from "I Agree" to "I Disagree." I know for a fact this changed, because I manually check for router and other updates, as well as the logs, on my own every morning as part of my security routine. This is particularly troubling, because I was having online banking 2-factor authentication issues in the ten minutes or so before the router reboot happened. I also got some wonky browser (MS Edge) error messages within the last 24 hours while using cloud-based UIs for applications that handle sensitive information. The admin UI says I still have V2.3.2.130, but I would like to confirm I still have the legitimate firmware and not some imposter. Is there any way to do that? Is there anything else I should do? All virus and malware scans come up negative as usual.