After my app launches Play Store it returns immediately to the app

After my app launches Play Store it returns immediately to the app

I have the rate app button in the app which lunches Play Store application
where the user can rate my app. I'm using standard code:
try {
String appPackageName = getPackageName();
Intent marketIntent = new Intent(Intent.ACTION_VIEW,
Uri.parse("market://details?id=" + appPackageName));
startActivity(marketIntent);
} catch (Exception e) {
}
The problem is that from time to time (but not every time), Play Store
application closes after few seconds and the phone returns to my
application. In this case the user won't manage to rate my app.