Tata Motors — About side indicator and hazard light

Since i brought tata nexon xms petrol varient, i have been facing problem in side light and hazardious light, when we start the engine it works perfectly and after few minutes it doesn't work and again after some time it might work, we have been regularly taking this vechile in authorized tata service center but they are not able to slove this issue, would you please help us to find the acutual solution