For the record, I will state that I either have no dysphoria or so little as to go unnoticed. My gender identity is rooted in a combination of male and female perspectives, energies, preferences, etc.
That said, from what I understand, folks have yet to figure out how gender fluidity happens. To my layman’s mind, I liken it a bit to multiple personalities in that something triggers a shift. What that trigger is has yet to be understood in some consistent manner.
It is also interesting in that some crossdressers have said something similar regarding the desire to dress. It comes and goes with a clear indication or assignable cause. Just another one of those mysteries so far. I can understand how a high level of demanding activity can cause a suppression of desires, but I suspect that it isn’t the only mechanism…