RF modules problem

In my project, i'm using three pairs of RF modules (RF Transmitter and RF Receiver) with the frequency 315MHz. The problem is when i send the signal at the same time (using other RF Transmitter) the RF receiver will go to reset or turn off. Please....help me.... THANKS

Is a receiver picking up signals from more than one transmitter? Then you must stop the interference by turning off the interfering transmitters.