Samsung Galaxy S4 GT I9505 sometimes it does not recognize the sim

Who can help me, I have a Samsung Galaxy S4 GT i9505, sometimes he does not recognize the SIM. I’ll explain my problem, your phone is fine for 2/3 days but sometimes I get the message SIM not present, and I have to turn off and on the phone sometimes does recognize me the sim. I have tried the sim in other phones and these always work. I have changed the sim card reader but the problem persists .Where I can control to solve, thank you to those who help me.