That would always be in the down run of the crypto currencies. For specifically bitcoin it can be the situation where altcoins are getting invested heavily while in other cases it could be the case where vice versa situation is presented. I think most of the time people invest or start trading when bitcoin is on the verge of FOMO curve. This curve occurs when bitcoin starts going upwards but thats because of FOMO investment which is temporary and thus give high chances for the bitcoin to drop. This way you can loose your money. So there are many point of analysis where your entries can be harmful for your trades.