Mac OS stops for a minute
Your systemstatsd


  The systemstats process is used to retrieve information about system
  statistics and power usage, and though it usually runs unnoticed in
  the background, the systemstatsd and systemstats processes have been
  known to randomly go haywire.


One method is to just kill that process for now.

In Terminal copy this and paste following

sudo killall systemstats


Enter your usual log in password.

You can do the same as above using your activity monitor, find the systemstatsd and kill it from there. (Force Quit)

After stopping it with one of above, do a SMC reset and normally it should not appear again.