i have noticed the same thing, stress can make one seem, apathetic? not as enthused? to sub or dom. i am a switch too, and i noticed the same thing for the last two weeks, and i figured out how to fix it. you might be having the same routine in your life, and that can be stressful just because of the repetition.
me, i have a daughter, and everyday is about her. i took her over to a babysitters, and had a ME day. it helped me.
so, change your routine, take a day off for yourself, and, make time specifically to do something. as a dom or a sub. write out a scene, or just something to do as domandsub. and do it, even if you arent Really in the mood. you will be by the end of it.