Default incoming messages are being delayed or recieved in bulk

i have indian motorola xt910.I need help .i am using artur 4.1.2 9.8.2O-124_SPUEM-14 IMPROVE_Light_XT910 rom.everything works perfect expect incoming messages are being delayed or recieved in bulk.i like this rom very much and all i need is to replace baseband but cant find the suitable file or proper procedure .please someone help me .