Sim card not recognized. After replacing tray twice?

I have a galaxy note i717r. I have been having troubles with the sim card not being recognized at all. I purchased a new sim tray complete with sd card slot. I replaced it and it seemed to work. After two days however the phone once again said No Sim. I purchased yet another sim card tray and tried that but wasnt able to solve the error at all this time. Please help if you know of the solution.

ps: I have also reformatted, reinstalled firmware, rooted it and tried titanium backup fix, and installed "vanilla" firmware to see if that would help. Nothing fixed it.