To me it happens whenever my A goal for the year is done. Since that's September this year, my blahs are postponed for about 6 weeks.
It's just natural, you can't go hard 12 months a year, if only for mental health.
A few questions, 1) what does your off season/ base phase look like?
2) are you following a periodization sort of schedule?
3) Do you have easy weeks during the year.
One thing about my program that I think helps with burnout is that it works on 4 week cycles. Within each cycle there's an easy week every 4th week
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You could fall off a cliff and die.
You could get lost and die.
You could hit a tree and die.
OR YOU COULD STAY HOME AND FALL OFF THE COUCH AND DIE.