If the laptop shuts down consistently after 30 minutes in Windows/Linux, but runs for longer periods of time in the BIOS, the problem is likely caused by malware. Performing a virus scan may find and remove the malware. If the time isn't consistently 30 minutes, overheating or a hardware defect may cause the issue.
To access BIOS on your machine, press the F2 key repeatedly as soon as you switch on your laptop. Most of the time, a prompt tells you to press F2 to enter setup, this prompt may be missing depending on your specific system though.
I hope my answer comes in handy for ya.
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