There could be a lot of reasons related to performance issues. It's hard to know without seeing the game.
What type of game is it?
What sort of events occur that precipitate hesitation in the game?
Is the game you made a mobile HTML5 game or does it install with a wrapper like cocoonjs or ejecta?
If you can, I would post a link to the game so others can see it.
I'm not suggesting you post a capx publically of your game, but you might want to seek out help from another developer to take a look at your project.
You could try to replicate the issue and post it.