Most of the time, in my case at least, the reasons for lost of focus are:
-Too much gear on the table, you don't need all that.
-Too much speculating on the web
-Focusing on irrelevant things like which compressor to use or how to setup sessions properly
-Talking, not doing
-Not knowing who you are in all that "music thing"
-No deadlines, not finishing
-No goals.
This.
Also, don't take it so hard man, i think after reading this thread we can all take comfort in the fact each of us will suffer this feeling from time to time.
I went thru about 3 months or so of it, only just coming good now, most of it was having gear that i was learning / not using to its full potential

"just grab a groovy bass line and make it fit. Like smashing the square blocks into the circle shape" illgreen