Nokia India — mobile auto working

Address:

B 34 waluj, Midc, Bulandshahr, Uttar Pradesh, 431005

I purchase nokia 6.1 plus from flipkart during 20/09/2018 and it is under warranty. Last two month i started to face problem of auto working this phone.
I am going to service centre spark it service rana nagar, aurangabad maharashtra, 431005 and told my issue.
In that i have face vibration problem and screen auto working problem submitted mobile on date 20/07/2019 and mobile received date 31/07/2019.
After 15 days later i am again facing problem of screen or mobile auto working.
Please suggest me to what should i do if am going to service centre again he said that submitted this mobile and problem will be resolve.
After one month this mobile warranty has been expired. If this type of problem happening again and again then what should i do.

I am not bear any service cost for that problem again in future.

So i request you to please give me permanent solution for this problem otherwise replace this mobile to new one..

Thanks and regards,
Anand jadhav