My friend, I do have Asus-Merlin installed, I have a USB drive connected, saving data to the drive is enabled, I have done the process , get it? I have learned from you that Traffic Analyzer keeps the data and I can go a select a day and see the usage for that day, and it does not need the USB drive. But I want to understand why Traffic Monitor data is not surviving reboot, I prefer looking at that data , I can see every day at a glance. Thanks again for replying and trying to help. I will keep trying to find a solution, if I have loaded the merlin firmware and set up a folder in my USB drive to save the Traffic monitor data, I have to find out why is not surviving a reboot, is a challenge, it has to survive it and I need to fix it. It has to work or I will totally lose faith in Asus and the merlin and return the damn set of XT8's.
Probably shouldn't jump in between you and Mr. Anti-ZenWiFi XT8, but I'll take my chances, I guess. As a long term, satisfied user of the ZenWiFi XT8, I have to wonder what traffic monitor data you're talking about. I've used Asus firmware 100% of the time that I've used the ZenWiFi XT8, and have never seen the traffic data go away with a reboot. With a full factory reset where you also tick the extra box that deletes the traffic data, yes. But not with just a reboot. Not sure what you're seeing there at all. My traffic data has been retained with all the Asus routers that I currently have at reboot, using all the firmware that I've been using for some years now. Even after flashing a new firmware version, the traffic data is retained unless I do a full factory reset with the above mentioned checkbox ticked.
Also, I've not needed to save traffic data on a disk, but I really don't care if traffic data restarts when I do a full factory reset. I hardly ever do a full factory reset, only when I'm having or expecting problems. I use the traffic data a lot, so I've had my eye on it just about every time I bring up the web admin interface to make sure that my clients are doing what they should. I've also had an ISP internet data cap until recently, so that gave me a good reason to care about client data use.
As to ZenWiFi XT stability, it really is very simple. When it's time to update your firmware, simply find a newer firmware version that works for you and you're done. This is much simpler if you keep your home network router demands as simple as possible...but that's apparently not always possible. My ZenWiFi has been very stable with security cameras, a solar panel controller, and various other odd electronics connected to it. Some people do have problems with their ZenWiFi meshes, and those are the complaints that you read about here. A lot of times those are simply remedied by settings changes, sometimes there's some bad hardware out there, and definitely some bad firmware versions (you simply revert to a stable firmware version). If you need absolute stability, you're well advised not to be the first user on new firmware. Watch for new firmware release threads here, and users will report on their experiences. But that's pretty much the case with any mesh hardware, it's more complex than one central router, or even a central router and an AP or two.
I wish you luck with your ZenWiFi, and am happy to help when I can.