Ratna that's why it is happening. July security patch comes with lots of bugs and now you can't go back to previous version. So next time don't be in hurry to update ur phone first see is it beneficial or not
well I didn't rushed onto anything. the day I got my hand on this device it already had the update. also it's not out fault. if their software is not stable they shouldn't just hustle up process and release it to customer.