I think this has been a big pain in my ass for a long time. I just watched raskolnikov's latest video on Pokerstrategy and he inspired me to deeply think about direct questions.
So what's this about? It's very rare for me to quit the day as a big winner, I mean like 5-10 buyins. Usually when I win quickly for example 3 buyins during the beginning of a session I tend to somehow feel scary. I mean, it's like only thing I can think is "What if I lose this money?" instead of "How I can make 5 more buyins?".
I've tried avoiding to watch my results, for example I played one month without watching my results once. The problem in that case I think was the fact that I didn't get "feedback" (money) from my actions.
I remember one day when I won something like 15 buyins, it was the time I used to play nl5 fullring and I had read this really basic nit-strategy guide that can make a monkey winning player in nl5 fullring. That time I had played something like 30-40k hands with a good winrate so I had the confidence.
I think the problem is most likely lack of confidence and especially poor results lately. When I really know and feel that I'm a winner at this stake - I can play long sessions and win big.
And sometimes when I've had streaks where I win 30-40k hands with a good winrate, I tend to get maybe too confident. I don't pay enough attention to making right decisions, then I have a huge downswing and the whole mental "round" starts all over again. I remember having many of those good streaks and then I face kind of meltdown. I think I haven't ever had a 100k hand sample with a solid winrate. Only very good times and very bad times, which usually ends up to breakeven results.
I pretty much solved this problem here myself, but I'd like to hear your comments if you have any feelings or experiences like mine.