C3700 Firmware Update

Very strange issue observed with C3700.  Today (06/29/17) at approx. 1:30 PM The C3700 lost its settings and defaulted back to its factory settings without My intervention.  I purchased this unit couple years back, and use it with TWC service.   I contacted TWC and the technician I spoke with indicated they did not push out any new firmware and that they do not have the ability to push it out because its not a supplied unit.  I informed the technician that I had no way to perform the firmware update myself, as I was informed by Netgear Tech. Support that only ISP can perform the update and push it out.  The TWC technician still clamed no updates were performed on thier end.  So, it appears that either the technician is mistaken and un-aware of some other TWC process that is performing the update, or My C3700 was expoited by unknown actor.  I decided to take the unit offline to perform a manual reset to factory defaults, and re-initialize the settings.  All appears OK now, however I still have concerns that the router has suffered a breach.  Circumstances like this, and not having ability to perform own firmware flash to ensure integrity of the unit is a cause of concern.  Remember, I was informed no updates were pushed out by ISP technician, and I certainly do not have access to the firmware, even though I bought the unit Myself.  So its anyones guess who performed the push.  One thing is for sure, the C3700 rebooted itself back to factory settings, and lost all configuration.   And Yes I did make a backup, but thats not the point.  If some unknown actor performed the update, who knows what actually is in the firmware?  Remember, the ISP Tech. indicated they did not perform the push of firmware, so who did?