Happening mainly with Controls and Texture Quality options. As recommended by devs, I changed the controls to the default DayZ preset, which works good for about 5-10 minutes and then automatically reverts to the previous setup I had, it happens with some graphic options as textures quality, the game always start with them set to 'Normal', I change it to 'Very high' and it happens exactly the same as with the controls, works for 10 minutes and then reverts back to 'Normal'.

Also, it doesn't save the changes when I leave the game, everytime I start it up, gotta change the config files.

Maybe it is a false impression, but I've noticed that the 'reverts' happens occasionally when the game start rendering a new area that wasn't rendering previously, but don't give much credit to this, as I said it is only a feeling than I'm getting more than an actual fact.