Too many limited ones, getting removed too quickly. Not enough time to get them.
Not enough habitats
Too many new dragons, too quickly
Removal of old dragons
Parity issues
Game crashing/ difficult scrolling,visiting
Prices of upgradable features( eg. Habitats,stables)
Friends/ neighbours quitting
Gold traps
Lack of communication from Team Lava
Boredom
Too many limited ones, getting removed too quickly. Not enough time to get them.