Im using soundpool to play sounds on the interval timer app i made. I recently got information that the timer does not work properly on cheap android tablets. I tried to change the sound classes to mediaplayer, but it did help.
It is hard to support all devices when the app works fine on emulator and my phone, but it has bugs on some random chinese products. It sucks to get bad rating because the users device does not fuction properly. Well this is one thing in Android that you just have to accept.