Ionic apps on low end android phones

I am building an ionic app which is doing upload of images to the server and lot of other things. My testers are reporting that the app hangs or crashes on some android phones while works smoothly on some phones.

I am not able to figure out how to reduce this problem as I have made lot of optimisations in the code and follow best practices for angular. This happens on android phones only and not ios.

I want to know your opinions and experiences if you have faced a similar situation. And how do you manage it. Thanks.

Check the plugins you are using, and read all of their quircks. Maybe you find the problem.