I have a Deco E4R in a dual setup. I'm currently limited in monthly data usage by my ISP and it's recently become an issue in the family, so I started monitoring data usage in the Deco app. In August, it displayed day by day data usage overall and by connected devices, but since the start of September, this part of the report is empty. 

I rebooted the router, cleared the app's cache and logged out of the app, then back in, but none of these things helped. My firmware is up to date and there was no update recently that could have caused this. 

Any ideas?