SENSE allocates the same address to multiple devices
I was investigating why son's phone wasn't able to communicate throught the SENSE, when I noticed that the SENSE had allocated the same IP address to another device. I rebooted the SENSE and suprisingly it allocated the same address again to exacly the same two devices again, although this time the address was naturally different. Here are screenshots from the SENSE app after the boot which shows that the address 192.168.71.106 has been allocated to both devices.
The unfortunate side effect was that the phone switched over to use the WWAN connection instead, using up my son's monthly quota for his subscription.