Why did you stop playing Farmerama ?

Just lately I’ve noticed a lot of my Farmerama neighbours have stopped playing the game, even some of the older, really keen players.
I know there may be a zillion reasons for this but it seems to happen in batches; I get a nice settled bunch of neighbours and then about a quarter of them will stop playing all at around the same time.
If you’re an ex-Farmerama player I’d be interested to know what prompted you to leave.
Thanks.