Check the device log to see if you have any errors. Depending on your Unity version you can use a generic way described here How To - Capturing Device Logs on Android or if you are using a beta release, you could try this package Android Logcat Package Feedback
Also make sure you don’t see any errors in the editor console after you build the apk. In addition to that you can try to build a standalone player to see if it’s android specific or not.