It has to be the well known memory problem you experienced. Try this, it is a nice workaround, which absolutely worked (for me at least):

germaniac(reporter)
2015-02-27 01:11

"My system has 8 GB of RAM and I had a swapfile of 1.0 GB in total. After increasing it to a - non-reasonable value - of 8 GB, DayZ does not crash anymore.

I believe it's a bug that DayZ, which is still a 32 Bit application, can somehow gather more than 4 GB of Ram from the system.

To circumvent, just temporarily increase your systems swap file so that you have at least 9 or 10 GB of (virtual) RAM."

Hello thec1aw.
This is an issue we are aware of (#0024916) and it has been fixed. However, feel free to submit another ticket in case the issue re-appears.
Regards,
Geez