Samsung — Samsung M30s smartphone is getting auto-restart, hanging and heating issue

I'm using Samsung M30s smartphone and it is getting automatically restarted on frequently and has hanging and heating issues from the last 20 days.

I have visited a service center at Thrissur, Kerala ([protected] - TVS ELECTRONICS LIMITED) and they have checked the phone and informed that there is liquid traces on PBA and SUB PBA, hence warranty cannot be claimed.

I'm very much concerned about this issue as I'm using a rugged back panel and there was no possibility of water going into the power port. Also, when I visited the service center I have met another 3 people who is owning the same smartphone has the same auto-restart issue.
So I want to make this incident into your notice and take immediate action on replace/repair my phone without any cost.

Below are the JobSheet details,

Model - SM-M307FZBDINS
Serial No - RZ8N202S16E
Bill No. - [protected]
Defect - Auto-Restart
Repair Description - Water logged PBA+SUB PBA

I have attached the job sheet information for your reference. Hope I will get a positive response at the earliest.

Thanks & Regards,
Shifin