locking and unlocking some iPads Play events are resuming only if i uncomment the log in SocketServer::ReadLoop #84

I am using Upnpx 1.3.6 playing an upnp event locking the ipad i am stopping the ssdp and after unlocked starting the ssdp again But the event is not playing unless i uncomment the log in SocketServer::ReadLoop method while (mReadLoop) For the first time lock/unlock scenario it is working fine but for the second time onwards i have to uncomment the following log
printf("mServerSocket=%d, highSocket=%d, sizeof(mReadFDS)=%d\n", mServerSocket,highSocket,sizeof(mReadFDS)); in SocketServer::ReadLoop,,Any one Please suggest some solution why i am getting this strange behaviour