[Q] Problem with galaxy s4 i9500 lollipop update(India) topic

Hello,
I updated my galaxy s4 gt-i9500 - Indian exynos version to android lollipop 5.0.1
After the update, the device is very fluidic and I never had any glitch. The update seems to be pretty stable as well. But around 2 weeks after this update I got this problem- my device got factory data reset on its own with everything erased from both internal memory and sd card as well. This happened when my device was kept on a table and when I saw it, it was turning on and then i found that startup screen that comes after the reset. After around 1 week, when I was using my phone a random message appeared on my screen saying "erasing sd card" I was pretty much sure that it was the same problem so I turned off my device, when I turned it on, everything from my sd card was erased, but nothing happened to phone memory. When I went to service centre, they were saying it could be a problem of the update. They seem to be not knowing about the problem and offered me to go back to kitkat. I dont want to go back to kitkat so my last resort was xda-developers. Please help.