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The edge 840 freezes after ejection from my Mac, and it became unresponsive once during the ride.

The situation is very similar to the one described here 
https://forums.garmin.com/sports-fitness/cycling/f/edge-840-series/356553/edge-840-freezes-after-ejection-from-garmin-express?pifragment-1290=4#pifragment-1290=5
However, mine also freezes during a ride which has nothing to do with ejection from a computer.

The outrageous part is that, this is a REPLACEMENT unit I just received 1 day ago, similar situation had happened to the first one I got.

I never expect this happened to a device worth 660 AUD from Garmin and it happened twice. 

I ringed Garmin Australian customer service line three times and no one picked up the phone, at this stage I really need Garmin to give me a definite answer regarding this one.