I think most of 1 and 2. But also, on a larger scale, something related to the Peter principle can happen: I spend way more time doing things that I'm not motivated for, because those are the ones I get stuck on. The fun parts are over more quickly.

Or maybe these are the mediators and not the prime movers. When I am in certain mental states most of the problems that I mention above can become much more severe or they can disappear entirely.