When connected to Wi-Fi services, I catch the Note 7 using my cellular data plan all the time. I can only get the device to prefer the Wi-Fi service by manually turning off the cellular data.
I don't have any speed issues on the Wi-Fi as my averages are 80-100 Mbps download and 18-20 Mbps upload via fiber to the home. Both download and upload speeds exceed averages available via the 4G service.
I'm wondering if there may be a software glitch that VZW should investigate to identify if their Note 7 software, is preferring to use cellular data? Perhaps to increase the VZW revenue?