Unhappy [Q] problems with the sim

Hello, I have a problem with the sim

When I turn on the cell for a few seconds I get the chance to enter the PIN code of the SIM, and then disappears and is not giving me the line of course.
in order to make the system work are forced to reboot via an app called OsMonitor UISistem the process, so I get the chance to enter the PIN of the card and everything works. I think it is a software problem because it also does with other sym.

I do not know how to solve, I also reinstalled the original stock rom and do it anyway. It could be as I have read that some applications give conflicts?

thanks if you have any suggestions.

Hello
Paul

P.S.
sorry for my english