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M3VPSS/M3VIDEO Stops running or hang after 12 to 15 hours of working

We have develop 960H DVR on DM8168 using following configuration. 
  1. Use 2GB DDR3 @ 796 Mhz and memory map is 2GB.
  2. TW2968 is front end encoder to support 960H stream data.
  3. RDK 4.0
  4. We are using Hybride DVR use case.
M3 is getting hang and not responding after 12 to 15 hours of working. At that time A8 core is running perfectly and with all the peripherals in working  state.
M3 hang time may change board to board. We have tested more then 8 boards and all the boards have same problem. I also try to print detail statistics every 60 second (Given in RDK code). But when M3 hangs this prints are also stop coming and stuck somewhere.
So what is a root cause of this problem and how i can solve it?