With a VPN enabled and device awake, the transition from Wi-Fi to LTE gets stuck

Originator:adam
Number:rdar://28389227 Date Originated:9/20/2016
Status:Open Resolved:No
Product:iPhone 7, iPhone 6s Product Version:iOS 10.0.1 (14A403)
Classification:Serious Bug Reproducible:Yes
 
If a VPN is installed, and it is set to Connect On Demand, and I move from an area with Wi-Fi to LTE (such as when I leave the office for the day), the phone will never make the transition from Wi-Fi to LTE unless I either turn on Airplane mode and turn it off, or disable the VPN. Sometimes if I lock the device and unlock it, the transition will work, but this may be related to bug #28389138

Steps to reproduce:

1. Install a VPN profile with Connect On Demand
2. Have the phone connect to a Wi-Fi network
3. With the device still awake, move away from the Wi-Fi network to an area where the phone should only be connected via cellular

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