For me, burn out is caused bad managers. Examples -
Lack of feedback:
"OK, take another task then"
"Well the problem is when do I say well done to the team?"
-360 silly review thing-
"Well your colleagues all gave you very good ratings and constructive feedback, however I think you have a very bad ethic, don't care about your work and seem to lack motivation"
"I need you to be able to do tasks without me having to check to make sure you're doing this right... -completes task-... "We can't use this, too complex, you should have checked with me!"
I've worked with very difficult CEO's but managed it due to having a very good working relationship with them and feeling their feedback was honest and impersonal.
I've struggled with managers who basically have a superiority complex and look down rather than viewing themselves as someone actually "managing" a team towards the goal of building a product.