Stuck in a rut / Bankroll flatlining

Ive been building my bankroll for a few months now and i've noticed that there have been two period where my account growth has flatlined and stayed still for weeks on end.

This happened originally a around the 800-900 level and now again at the 2300-2700 level (I'm playing at the pp NL100). Now I know variance has a lot to do with this type of thing, but i can't help feeling like its part mental too.

What I'm wondering basically is how many people have these long stretchs where they don't necessarily lose much but they just seem to hover, and how they think it affects there game and mentality.