there are few things you should consider checking.
-re-seat memory. clean ram pins using pencil eraser. if two modules, try using only one
-clean cooling fan air vent. if clogged it will cause laptop to overheat
-virus can cause laptop to restart too. check with a descent antivirus that you can boot from usb or odd
-error of hard drive can cause a restart too. chkdsk the hard drive
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