Xiaomi India — Mi 3s 16gb gold

Address:	138118
Website:	I don't know

My phone's below three buttons (back, home and recently view aap) are not working.it is completely not working so please give me some advise to prepare the buttons of my phone without belows three buttons I can not use my phone properly I have to restart my phone after using any application I don't like that every time I have to restart my phone.My phone is in under warranty but I can not visit the service centre because it is too far from me.So please give me some advice to repair my phone's below buttons.