3或4小时后未收到Fcm通知

Question

当我在设备上安装应用程序后3到4个小时运行正常，我的项目中已经集成了Fcm通知，此后我无法收到任何通知。我认为它仅在oreo中发生，因为它在我的miui牛轧糖设备中起作用。 -我想在收到消息时进行公开活动。这是我的android代码：

    public void onMessageReceived(RemoteMessage remoteMessage) {
    super.onMessageReceived(remoteMessage);
    Log.d(TAG, "Message " + remoteMessage.getNotification());
    Log.d(TAG, "Message1 " + remoteMessage.getData());

    JSONObject jsonObject = new JSONObject(remoteMessage.getData());
    try {
        f_Id = jsonObject.getString("fid");
        Log.d(TAG, "F_ID" + f_Id);
    } catch (JSONException e) {
        e.printStackTrace();
    }

    mContext = getApplicationContext();
    util = new Util(mContext);
    back_suburllist = new ArrayList<>();

    createNotificationChannel();
    getApiData();
}
public void getApiData(){
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        Intent openActivity = new Intent(mContext, Activity_Transparant.class);
        openActivity.setFlags(Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS | Intent.FLAG_ACTIVITY_NEW_TASK);
        openActivity.putExtra("listBundleActivity", bundle);
        mContext.startActivity(openActivity);
    } else {
        Intent intent = new Intent(mContext, BackLoadUrlService.class);
        intent.putExtra("listBundleValue", bundle);
        mContext.startService(intent);
    }
private void createNotificationChannel() {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        String CHANNEL_ID = mContext.getString(R.string.default_notification_channel_id);
        CharSequence name = getString(R.string.channel_name);
        String description = getString(R.string.channel_description);
        int importance = NotificationManager.IMPORTANCE_DEFAULT;
        NotificationChannel channel = new NotificationChannel(CHANNEL_ID, name, importance);
        channel.setDescription(description);
        NotificationManager notificationManager = getSystemService(NotificationManager.class);
        notificationManager.createNotificationChannel(channel);
    }
}