Dear Samsung Member,
Greetings from Samsung Customer Support!
To resolve your device hanging issue please visit this link: https://www.samsung.com/in/support/mobile-devices/how-to-restart-the-device-when-freezed-or-hanged/
For further assistance, register your concern in Samsung Members Application (Open Samsung Members Application > Get help > Send Feedback > Error report/Ask questions).
Thank you for writing to Samsung.
Samsung Customer Support
Everyone who is facing motherboard issues with their Samsung M30s and other samsung devices. kindly get your problems register over Samsung's customer care and give them feedback, As they don't have any of such complaints and feedback for this issue, the more you all will comlaint only then this issue will get Attention and then they will find some solution for this issue. And Please Start posting your problems on twitter and tag Samsung Officials.
I am also facing the same issue with my m30s. done complaint on samsung care and talked to the Area Service Manager of samsung but nothing happened. As, he said he don't have any comlaints regarding m30s restarting issue and motherboard issue, so i have to pay the price for the motherboard, Not got any positive Response him.
So, just start complaining and tweeting about this issue, so that they recall the devices having these issues. if you people don't want to waste your money.