David Allen claims that most people's GTD-ish systems fall out of order every now and again, and this is to be expected, various real changes in life require changes to the system, rethinking of personal priorities etc., but we're pretty bad at spotting them pre-emptively.

I think noticing such problems earlier would be very helpful to me, and I tend to come back on track faster than in the past, but I'm still not terribly happy about it.

My most common akrasia-like problem is frequent gross misestimation of available time when I have high mental energy - most tasks compete for this, and amount I have is unpredictable, but not random, and I haven't figured out makes my mental energy more or less plentiful. Some minor correlates are higher room temperature (26-28C range seems optimal), more physical exercise during the last week or two, fewer distractions, cleaner room where I work, frequent naps, and better maintained GTD system. These are pretty solid, but that's still not enough to explain most of variance.

I cannot think of any recent akrasia related to anything that didn't require high mental energy levels, except during some GTD breakdowns.