I too have had this problem yesterday and today. Random crashing and unable to reproduce as it happens randomly and without warning.
Crash 1 - Travelling up NW airfield, just up from the tower blocks. DayZ.exe stopped working. Crashed on road.
Crash 2 - Further up the road, sorry can't be specific. Was crouching still near a bush. DayZ.exe stopped working.
Crash 3 - Small town north of Starry Sober, crashed whilst eating food in small house. DayZ.exe stopped working.
Crash 4 - (Died)Respawned near Electro. Traveled to Electro with a random player, crashed near house near entrance to main town (past harbor). DayZ.exe stopped working.
I have uploaded the dump file together with the DxDiag.txt, hope this helps! (DayZ_Crash_Report_With_DxDiag.rar).
Also, these are all within 5-30 minutes from starting up the game. Rolled back Mantle driver and installed previous one but crashing persists. Other Steam and non-Steam games work fine (CS:GO, BF4 etc..) Temps for CPU and GPU stable - did overclock GPU but reset to see if this was giving the crashes but still persists.
EDIT 1 @20.59 GMT - Just crashed again (Dayz.exe has stopped working) loaded up character from crash 4, began looting and tried swapping jeans with ones found one floor in building. Crashed with (Dayz.exe has stopped working).
Edit 2 :22.03 GMT - Crashed again. Was with some player, had to run off (was still in Elecktro), ran into a building - approaching a screwdriver on a metal shelf and game froze for a few seconds and crashed (Dayz.exe has stopped working). I have uploaded a second DayZ Dump folder incase this helps comparing the two where two crashes have occurred tonight.
The DayZ dump file lets me open it with Visual Studio, so I opened it up and took a screenshot (apologies if this is no help, it throws an error exception, didn't know if this gives any more info).