I've had my 5x for about a month and yesterday it started randomly rebooting for no apparent reason. It happened 3 times yesterday afternoon, not during any activity and not connected to any HR monitor or utilizing GPS. Just sitting in my house and riding in my car. It would start vibrating 3 times and the Garmin triangle would be in the middle of the screen. Half the top icon line of the Gearmin face would be cut in half but still there, and then the 5x would be back in action like nothing happened. No data lost and all connected to my phone. However I'm afraid that if this did happen during a run that it would be a disaster for time and distance. It happened all over again twice this morning for a total of at least 5 "reboots".
Currently running on 9.71 beta. I performed a soft reboot this morning, about 2 hours ago and nothing new yet. I've attached a miscrosoft paint rendition of what it is I see.
ciq.forums.garmin.com/.../1373682.png