I have had my Ionic for about a week and a half now and it randomly reboots about 3-4 times a day. I'm on the latest firmware, using the default clock face, and don't have any third party apps on the Ionic (deleted the Starbucks, etc. apps on there by default too). I also tried doing a factory reset and starting over. Nothing seems to help. It's even more annoying because prior to the reboots, it apparently freezes and stops logging steps and/or sleep. For example, the other night it stopped logging my sleep in the middle of the night and had no data until I woke up. I am having buyer's remorse with this.
