Lenovo — k8 note mobile stuck in boot loop

Address:

Ahmedabad, Gujarat, 380013

I updated my k8 note to oreo few months back. The phone was working fine till today morning.[protected]. I already went to lenovo service center they tried updating the software but no results. They returned back the device stating it is a pcb/motherboard problem. I am fed up of this it is restarting every single minute. The phone gets stuck at lenovo logo page on restarting and restarts again. Please provide a proper solution.