Dinesh
a. What have you plugged into these boards? Have these boards being modified?
b. How are they being powered ?
c. How are the boards being used ?
We need more info to root cause the problem.
Do you want the boards repaired? If so, please follow this link.
http://www.spectrumdigital.com/rma_form2.php?osCsid=f62328e2920e8f58c6453bd038399b92
Thanks
David