I'll take a wager and say it's overwork. If you're a startup, and a successful one, you're probably very busy. Busy doing a lot of things, wearing a lot of di

I'll take a wager and say it's overwork. If you're a startup, and a successful one, you're probably very busy. Busy doing a lot of things, wearing a lot of different hats. Many startups can be victims of their own success, and don't necessarily scale up well, or at least well at first. There can be some real ups and downs. If you get traction but then are in a hiring frenzy, that can be hard, since you have your normal workload, plus the additional workload of interviewing.