Series 60 Application Hanging after 3 to 4 hrs

Hi

I am working on application on series60 v1.2(NOKIA 3650).My application needs opening and runing for long hours of socket communication(infact endlessly).I found that if it stays opened for say more than say 3 to 4hrs I have to reset the device to make any appliction(communication) working (hang).Even phone call is not coming.It works fine for those 2-3 hrs but later gets hanged.I dont understand this behaviour.I saw for memory leaks and I could'nt find any. Anybody Pls help me in knowing this........

thanks,
JA.