I have had burnout in hobbies and once in a job. As a new tournament chess player I (deserveably) started out with a low rating (used to compare players, and "seed" them in tournaments). If I did well, great, but if I didn't, so what? As I got better, losses still hurt but winning was not as much of a high. Frequently I played because it was "expected/required" of me. Finally, while waiting for the next to last round of a one day tournanent to finish (a last round win would have meant a share of 2nd) I was extremely uptight. Finally I got the thought, "Chess is a recreation and you are not enjoying yourself. Why are you here?" I dropped out, sold or gave away most of my chess books, and cut way back on how much I played.
Another hobby was similar: irritants bothered me more and I didn't enjoy it nearly as much as when I started. Adios.