My phone also reboots. It's not at random times. It's whenever I'm at certain locations. If I'm connected to the wifi at my house, I get "random" reboots. Sometimes up to 6-8 per day. The network at home uses a 192.168.1.x address range with 2.4GHz and 5Ghz wifi bands. If I'm at work with a different subnet, it's just fine. FXtec support knows about the issue, the first thing they asked when I said I was getting reboots and couldn't hold a call, was "are you using wifi and is wifi calling enabled".
If I'm using wifi at my house, I can make a call for about 1 minute and 20 seconds before t