java - GCM not receiving somtimes -

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I am using Java servlet with mysql but GCM works but sometimes it does not send the message to the device Used to be.

This is my code 

  from sender = new sender (GOOGLE_SERVER_KEY); String mess = "few messages"; Message message = new message.bilder (). Timetolyive (0). Deliveully (true) .addData (MESSAGE_KEY, mesg) .build (); (MMM MemberModel Member: Member Modell) {If (Member .Uriid! = Creator ID) {try system.out.println ("regId:" + member.gcm); Sender.send (message, member.gcm, 1); } Hold (exception e) {}} hold (exception e) {System.err.println (e.getMessage ()); }}}   
 Please help me fix this problem.   
 
 
 If you can send and receive GCM messages at times, there is no error in your project  
 Again, I also faced this problem, I modified my code several times, and raised a question in Stackworflow.  
 But I got GCM messages after 2 days.  
 This is probably the problem with your phone or GCM server

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