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

I had a problem with my Samsung S4 Galaxy with Android Kitkat 4. My internal memory card was completely full.
In Settings I found it was an app in the Application Management. 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 this file , but it was growing again. I think itt has to do with synchronisation between some accounts. Maybe Google or Facebook. I stopped the procesĀ and then it was okay :-)