Android TabbedActivity randomly shows fragments but is most of the time blank : I created a TabbedActivity with some fragments, these fragments sometimes load and sometimes they dont, i've searched everywhere but couldn't find the issue.

[Example gif][1]

**This is my main activity:**
   
    package <....>;

    import <....>;

    public class TwitterActivity extends AppCompatActivity implements MessagesFragment.OnFragmentInteractionListener, NotificationFragment.OnFragmentInteractionListener,
                                                                    ProfileFragment.OnFragmentInteractionListener, TimeLineFragment.OnFragmentInteractionListener {

    private static final String APP_TAG = "Twitter";

    private SectionsPagerAdapter mSectionsPagerAdapter;
    private ViewPager mViewPager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(null);
        setContentView(R.layout.activity_twitter);

        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        final TextView toolbarTitle = toolbar.findViewById(R.id.toolbar_title);
        setSupportActionBar(toolbar);
        getSupportActionBar().setDisplayShowTitleEnabled(false);

        mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());

        mViewPager = (ViewPager) findViewById(R.id.container);

        mViewPager.setAdapter(mSectionsPagerAdapter);
        mViewPager.setOffscreenPageLimit(3);

        TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);

        mViewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
        tabLayout.addOnTabSelectedListener(new TabLayout.ViewPagerOnTabSelectedListener(mViewPager));
        tabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
            @Override
            public void onTabSelected(TabLayout.Tab tab) {
                int position = tab.getPosition();

                if(position == 0){
                    toolbarTitle.setText(R.string.tab_timeline);
                }else if(position == 1){
                    toolbarTitle.setText(R.string.tab_messages);
                }else if(position == 2){
                    toolbarTitle.setText(R.string.tab_notifications);
                }else if(position == 3){
                    toolbarTitle.setText(R.string.tab_profile);
                }
            }

            @Override
            public void onTabUnselected(TabLayout.Tab tab) { }

            @Override
            public void onTabReselected(TabLayout.Tab tab) { }
        });
        tabLayout.setupWithViewPager(mViewPager, false);

    }

    @Override
    public void onFragmentInteraction(Uri uri) { }

    public class SectionsPagerAdapter extends FragmentPagerAdapter {

        public SectionsPagerAdapter(FragmentManager fm) {
            super(fm);
        }

        @Override
        public Fragment getItem(int position) {

            Log.d(APP_TAG, String.valueOf(position));

            if(position == 0){
                return TimeLineFragment.newInstance();
            }else if(position == 1){
                return MessagesFragment.newInstance();
            }else if(position == 2){
                return NotificationFragment.newInstance();
            }else if(position == 3){
                return ProfileFragment.newInstance();
            }
            return null;
        }

        @Override
        public int getCount() {
            return 4;
        }

        @Nullable
        @Override
        public CharSequence getPageTitle(int position) {
            switch (position){
                case 0:
                    return getString(R.string.tab_timeline);
                case 1:
                    return getString(R.string.tab_messages);
                case 2:
                    return getString(R.string.tab_notifications);
                case 3:
                    return getString(R.string.tab_profile);
                default:
                    return getString(R.string.tab_timeline);
            }
        }

    }

    }

**This is one of my fragments (They are all the same):**
    
    package <....>;

    import <....>;

    public class TimeLineFragment extends Fragment {

    private OnFragmentInteractionListener mListener;

    public TimeLineFragment() {
    }

    public static TimeLineFragment newInstance() {
        TimeLineFragment fragment = new TimeLineFragment();
        return fragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (getArguments() != null) {
        }
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment_time_line, container, false);
    }

    public void onButtonPressed(Uri uri) {
        if (mListener != null) {
            mListener.onFragmentInteraction(uri);
        }
    }

    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        if (context instanceof OnFragmentInteractionListener) {
            mListener = (OnFragmentInteractionListener) context;
        } else {
            throw new RuntimeException(context.toString()
                    + " must implement OnFragmentInteractionListener");
        }
    }

    @Override
    public void onDetach() {
        super.onDetach();
        mListener = null;
    }

    public interface OnFragmentInteractionListener {
        void onFragmentInteraction(Uri uri);
    }
    }

**This is my main activity's layout file:**

    <?xml version="1.0" encoding="utf-8"?>
    <android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/main_content"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    tools:context=".activities.TwitterActivity">

    <android.support.design.widget.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/AppTheme.AppBarOverlay">

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_height="wrap_content"
            android:layout_width="match_parent"
            android:minHeight="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            app:popupTheme="@style/AppTheme.PopupOverlay">

            <RelativeLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent">

                <ImageView
                    android:layout_width="25dp"
                    android:layout_height="25dp"
                    android:src="@mipmap/ic_launcher"
                    />

                <TextView
                    android:id="@+id/toolbar_title"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_centerInParent="true"
                    android:text="@string/tab_timeline"
                    android:textSize="18sp"
                    android:textStyle="bold" />

            </RelativeLayout>

        </android.support.v7.widget.Toolbar>

    </android.support.design.widget.AppBarLayout>

    <android.support.design.widget.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom"
        android:elevation="80dp"
        android:theme="@style/AppTheme.AppBarOverlay">

        <android.support.design.widget.TabLayout
            android:id="@+id/tabs"
            android:layout_width="match_parent"
            android:layout_height="56dp"
            app:tabGravity="fill"
            app:tabIndicatorColor="@android:color/holo_orange_dark"
            app:tabIndicatorHeight="0dp"
            app:tabMode="fixed">

            <android.support.design.widget.TabItem
                android:id="@+id/tabItem"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/tab_text_1" />

            <android.support.design.widget.TabItem
                android:id="@+id/tabItem2"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/tab_text_2" />

            <android.support.design.widget.TabItem
                android:id="@+id/tabItem3"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/tab_text_3" />

        </android.support.design.widget.TabLayout>

    </android.support.design.widget.AppBarLayout>

    <android.support.v4.view.ViewPager
        android:id="@+id/container"
        android:layout_width="match_parent"
        android:layout_height="100dp"
        android:layout_above="@+id/tabs"
        app:layout_behavior="@string/appbar_scrolling_view_behavior" />

    </android.support.design.widget.CoordinatorLayout>

Please help me :C
  [1]: https://imgur.com/wQ3nKZC