Maybe it just doesn't like you.
Quite seriously, when using a yeast strain that's been propagated for use in one (or two) breweries, it adapts to work well in a certain set of conditions. Take it out of that environment, and it may well not perform. It's just a case of wether it likes your gear, methods, and worts, or not.
I've kept the Hook Norton (Hogs back) slurry in the fridge 3-4 days where it's settled to the bottom, with liquid above. Poured off the liquid, pitched it and Vavoom! It goes off like a rocket. It's done something like this each time...
3-4 hrs after pitching - Adaptive phase
8-12 hrs - Krausen building
3 ferments at about 18hrs - High Krausen
36-48hrs - Anaerobic ferment
54hrs - slowing down
Some ferments take longer than others depending on OG and fermentation temp, but they all basically go like that.