Greed and also too much faith in some project. I think whenever it shows bad sign then you should start to sell don't put too much trust in this because it can dissappear so easily so better safe than nothing. Greed is also the main enemy of us whenever greed completely control us then you will loss because you think your brain is the player of market
Right,holding too much longer on some project will make us to be fool so that is why we need to exit that project if we are not able to hold losses from that capital.
For signals it will be better to completely ignore than trusting with backup plans because we knows that this market is not predictable by anyone so why we need to trust them.