i heard about this..but i found another way...hehe...if using emulator on pc, just create macro to open your inventory or the menu every 10min. tested this afk farming Zodiac boss for 12hr straight...no disconnect, except for that forced close error coz i put the most minimum spec 1core/1gb ram for my nox instance.

btw..feeling boring liao with all these farming and not sure if i can really can tahan these grinding without spending money

Core drops used to be regardless your level
I maxed out my first east cores when i was level 40. I forgot to do em.

I was doing well when im 50 + on the second one.
As long as you farm the cores around the boss spawning. 10-30m range from the spawn site.
and now im level 60. I had a good run of core drops at ant dungeon 1 yesterday until about 1am. Then everything slowed the duck down. 
Just use the macro feature that is provided by Nox/MEmu.
It records your touch or keyboard hits. Also can be customised on the repeat duration and stuff. Pretty straight forward i say. You just gotta experiment with it.