Is this on the latest firmware (10)? My 830 did that on Sunday, about 3 hours into a 7 hour ride. Had to hold the power button down to reset it but at least was able to continue the ride. No storage corruption (ran chkdsk) and so I think it's a bug in 6 (equivalent 830 version to 10 on the 1030).
Mine locked up once during a ride at the weekend. (F/W 10.00) It happened on completion of a ClimbPro climb as the edge switched back to the previous data screen, which was the course elevation profile.
It appears to be just the display that's locking up as I was still getting radar alert tones (though no on-screen indications). The 10-second power button reset was enough to bring it back to life though it can take a good couple of minutes for it to fully start up.
I suggest you file a support request with Garmin. I'm feeding it back as part of an ongoing support request from the beta. If Garmin don't get many reports though they won't do anything about it.
I think that in some situation garmin cannot handle in the same time multiple screens notifications
Mine froze while almost enter in stand by and get the count down, 3 , 2 ,1 and second notification "off segment" , somehow in the backgroud somwthing was running but screen and keys where frozen, after several power button press, device restarted eventually