Hello,
I've an home net using six Deco M5 in router mode.
All works well, no issue, good speed and good stability.
My main Deco M5 is connected to a Zyxel LTE 5398-m904 and use cellular data connection.
For me is very important to check the data usage and so I use the monthly report function. Unfortunately it is totally useless and full of issues.

I get randomly data about data usage:

1. - 1st day of the month (after few hours of new month) I get about 110Gb of data usage (It is impossible in 1-2 hours and with no device conntected to Deco mesh)
2. - If I reset to zero.. it shows me correctly "0 kb" of data usage but after less thna hour I got again crazy value like 100Gb o 85 or 110 randomly
3. - Some days, while my normal consumption is about 6-10Gb per day, I get 60Gb.. other day 150mb
4. - When I made a reset .. the data usage of single device were not reset to zero

I'm the only one in this situation with monthly report? 

Thanks
Roby

PS: I call italian support dozens of time but NEVER, I repeat, NEVER obtain a call with, after 3 mins of waiting they drop the line.Outrageous support