This is a general story, if you have not heard this story then you are just getting started, and if this have not happened to you, well soon it might as long as you are full into crypto it is bound to happen, i can't say it's greed because greed really has nothing to do with this, this is where emotions come in to play like your mind is a football field, the withdraw or wait a little bit longer to you falling asleep and waking up to realize that you have been a victim of a pump and dump, or a free fall that was directed to you, haha 
, what have i not said... Maybe greed too!!!
The volatility is the main problem in crypto trading, you can wake up to a 10x balance or the other way around. Even low liquidity makes slippery stops, the stop orders are not executed on the targeted price but in the last available bid/ask order. Emotions are part of the whole story as well, managing feelings is crucial to avoid big swings on performance tracking charts. Taking profits is better than trying to catch the maximum on the trend, IMHO., what have i not said... Maybe greed too!!!