Unfortunately I can't pinpoint the exact problem as I'm not an Android expert and with so many devices out there it makes it even more of a challenge. It could be because the game has gotten too large. I saved as much space as I could for Android but it's still pushing it, the original file size is over 25GB. Updating drivers could possibly help, other general troubleshooting could help. Joiplay could be a solution.
I know the game can be heavy on certain devices. Most players can play it smoothly while others can't.
To explain it a bit better:
The engine used to make this game works great for Android, but over time this game has become one of the largest adult games out there and thus is pushing the limits of said engine with thousands of animations and images. Basically the engine's file size allows a maximum of 2GB.
Right now it's slightly under that thus on certain phones it will run fine, (including mine) but on other phones it can cause lag and whatnot. PC/Mac will never have issues running this game.
I'm confident that splitting the game into two parts for Android systems will solve said issues because of the file size reduction. However, that does need tons of tweaks to the code, files and other things thus it's planned for the next release.