The mobile version has a bug and that is if you open the menu while playing there is a possibility that the game stops responding
Thanks for the report.
What is the specification of your mobile phone ? (´・ω・`)?
Sorry but I don't know
You can tell phone brand and model, its pretty much all info needed here
I didn't think that had anything to do with it but it's okay, it's a Motorola e⁵