[tendeer]

From my experience, it's almost always both. There are things about the environment and work nature that are not conducive to the said person - thereby not allowing said person to function optimally.

Most times there are some things under the individual's control. Examples: Being more explicit with the manager about the kind of work that one would like to do, coming in an hour earlier (and leaving an hour earlier) to get some solitude in the mornings in an open floor plan, blocking calendars to disallow meetings at one's most productive time, etc..

But having said that, most relationships quickly become toxic when too many things start to fail. One is never sure if it is just oneself or the environment, if a certain action is just the boss having a bad day or part of a larger corporate thought process. At this stage, one is left with no choice to leave.

The best advice I can give is to take an extended vacation (10+ days) at such a point. Clarity often strikes when the immediacy of the problems are no longer at hand.