Great game with some issues

So I downloaded this game a around 9 months ago. It is fun and really entertaining. BUT it has some serious issues. First of all, is almost impossible to get Dragon Stones (a main currency in the game) after all the quests are completed. The events are extremely difficult even having all your characters maxed out. The game also crashes on key moments like when you use Dragon Stones to do a "Summon". Once it crashes you lose the stones and dont get your reward. Has happened to me 3 times. And finally the summon rate is crazy low "3-5%" at least for me. The recent events have a lower rate so expect tons of R rated cards, even on Multi-Summons. One of the best mobile games out there but it can be better, specially if they add a "trade" option. For now I will stop playing because even tho it is a "Freemium" game they want to force you to pay for Dragon Stones every time they possibly can. Like I said, great game but the developers are getting greedy

LGPAIN about DRAGON BALL Z DOKKAN BATTLE, v3.0.1