Problem with Samsung Kitkat Android phone memory full. The problem and my solution

I had a problem with my Samsung S4 Galaxy with Android Kitkat 4. My memory card was completely full. A tool said it was the apps folder. I erased some apps, but some time later the internal memory was full again. Eventually I saw it had to do with "contacts". It was 4,6 GB !!! I erased, but it was growing again. I stopped the proces and then it was okay :-)