Hi! More info is needed about crashes:
1. Are you playing app or browser?
2. It crashes after particular things you do, some event or else?
Viewing post in My Jazzy Lolly Crush (MyJLC) [v1.3] comments
I have no way to reproduce these crashes and see what exactly is causing this. The only thing that is advised on the web for your model is to pay attention to updating Android to the latest version and clearing the cache of the game itself.
Also an official support of your device have a bunch of their own recommendations to follow: https://www.vivo.com/sg/support/questionList?categoryId=54431
Please let me know if any of this helps.