Fenix 5 rebooted/ reset itself

After 1.5 weeks with the new Fenix 5, just out of the blue the device reset itself! I lost all performance data and worst of all, all the customization of apps/fields that took me a few days to setup. I noticed that i have lost some of the HR data from the last 4-hour widget and then a couple of minutes later i noticed that the watch face was back to the stock one. upon verification i noticed that i have lost all setup. hmm, sucks big time!

Any suggestions on what to do? is there a log i could review?