Unrelated but relevant advice: Is this a refurbished laptop?

1. Make sure to run Lenovo Diagnostics software; you can get it from official Lenovo website and check for any hardware issues during the stress testing.
2. Check if BIOS password is removed.
3. Test for memory RAM errors: disable secure boot in BIOS, then run Memtest86 test via a bootable USB to check for any memory errors.