If it beeps before shut off then warning could be for excess heat or low battery.
Excess heat ensure fan grills are clear.
Batteries especially in a 4 year old laptop will not last long.
BIOS DO NOT UPDATE. BIOS update is only to care incompatibility poblems when upgrading.
Device problems, PC inventory takers :-
Belarc click here
SIW click here
SiSandra click here
will show all devices installed make sure you have the latest drivers for them.