R7000 - hard reset overnight

DavidStewart, you've got a different router and it could very well be where you have the router and ventilation on the unit.

test4321, well first I doubt the log entries. One reason being if the ROUTER truely was reset or even rebooted, all logging is lost so you don't know what happened before the reboot if there was any information in the log that might point a finger at something? Matter of fact, the first few lines in the log would verify if you had a reboot. They usually will log entried with old dates first then the real date and time. Like this:

[Time synchronized with NTP server] Tuesday, Apr 30,2019 17:57:20
[Internet connected] IP address: xxx.xxx.xxx.xxx, Tuesday, Oct 09,2018 16:43:00
[Initialized, firmware version: V1.0.4.28_10.1.54] Thursday, Jan 01,2015 00:00:13

Also, on the Browser Genie when logged into the router, select the ADVANCED TAB. In the INTERNET box, select SHOW STATISTICS. That LAST column will show UPTIME. If there was a reboot you can then tell how many hours ago.

However, I'm quite SURE this isn't the problem! This is, "Firmware: V1.0.9.64_10.2.64". If you search the forum here, you'll find many many problems with this firmware, even probably what you are experiencing.

Basically that release and the one before it are just unreliable to put it nicely. You need to do two things:

1. Revert to firmware version V1.0.9.42 (Support at top menu, enter R7000, press enter, select DOWNLOADS, at the bottom of the list expand PRIOR VERSIONS, select and expand V1.0.9.42 and click on the README. Follow direction in that documents (including the link to get) and backlevel the firmware. DO NOT reload from a saved configuration your settings. Test first, and if you still have a problem, RESET (see manual if you are unsure how to do it) TO FACTORY SETTINGS and MANUALLY enter them. Suggest you take screenshots of those you changed so you know what to set them to.
2. After DOING #1, on the ROUTER UPDATE page, TURN OFF AUTOMATIC UPDATES.

Doing the above should get you working again. However turning off updates will stop ALL future updates. Versions .60 and .64 did have some 'fixes' (and breaks in .60 probably fixed in .64) that might be needed. A future release might come out that you need. So either keep watching in the forum for a new release or use the router CHECK FOR UPDATE function. When it is newer reported than the .64 release check back to see if it is worth installing. If so, install that.