I am using TPS61070DDCR as a 5.5V supply regulator IC in my design. The input voltage is provided with a LiPo battery which has 3.0V to 4.2V supply range, the output voltage is 5.5V with less than 50mA as the output current. The regulator works perfectly for a few days then it will get damaged by showing output voltage as less than 4V eventually getting short-circuited. When I checked the temperature that appears across the IC is a maximum of 60 degrees Celcius. The load is an LCOS display and if I unsolder the TPS61070 from the pads the display will back drive the 5.5V rail with 2.7V. I couldn't find any reason for this issue, please help me to find the reason for damaging the IC? I am attaching the Schematics of the regulator with this post.