Hiccup mode problem of DPA switch

hii....
We have design 11.5W Dc-Dc power supply using DPA424PN Switch.The Specification are given below-
Input Voltage : 24-25VDC
Output Voltage : 1) +15V @ 0.5 Amp
2) -8V @ 0.5Amp
Output without load is OK but when we add 0.1 Amp load at +15V then we get 15V at output but after 2 sec output diode (MUR110) get heated and output goes 0V.
then we replace output diode (MUR110) with 1N5822 diode and we get output at 0.1 amp.
please tell us why output goes to 0V by using MUR110E diode?