Game is crashed while catching cave monster

Game is crashed while catching cave monster and when I restart the game the battle is ended automatically. This happens a lot after the update. I'm using iphone4 with the lastes ios update for iphone4. I hope this may worth to look into it and fix.

[support7]

Dear player,

Is it working well now when you try to catch cave monsters? As we tested this and enountered no problem with that. We suppose the crash issue was possibly cuased by small RAM in your device. Please delete some apps that you dont' need for the time being and make sure no other apps running at the same time, so as to set free more space, then see if it gets better. Thank you.
Any further questions, please feel free to let us know.

Best Regards,
Vicky
Support Team