I have been experiencing this a lot in the last weeks, regardless of the server being almost empty, full, public or private.
Every few minutes the game freezes for a few seconds and then everything goes back to normal (of course I died several times because of that! Sigh!).
The first days (even weeks) after 0.58 hit stable everything was fine, then I started to have this problem.

Here a self-explanatory video example that I have recorded:
https://www.dropbox.com/s/zsk0bujq4di6ocj/DayZ_Freeze.mp4?dl=0

Thanks,
Holt