Edge 830 locks during ride

During the last three rides my Garmin Edge 830 has stopped working during rides.  The battery is charged, and has the current updates.  During the last three rides it has locked up and stopped working during the ride(s).  It does not capture the entire ride, and does not record any information after locking up.  I tried holding buttons to get it to unlock and nothing.  I have waited for the battery to die and allow it recharge when this happens.  I have also waited until I got home and plugged it in to unlock it.  No matter what I do, including reformatting it to a "new" system, it still locks up.

any advice as to how to prevent this from happening is appreciated.  Am I the only one in recent months to have this problem?